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Thread: i/o error when using Netbeans 7.3 and Java 7

  1. #1
    Junior Member
    Join Date
    Apr 2013
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    Default i/o error when using Netbeans 7.3 and Java 7

    Hello Java Guruís,

    First of all, I haven't touched Java code since 2008, so I'm re-re-learning Java. It's true; you can't teach an old dog new tricks.

    Iím having an i/o error when using Netbeans 7.3 and Java 7. The .jar manifest compiles correctly (I can execute the program without errors by double-clicking it in windows explorer) and is saved at the following location:

    \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\dist\JavaFXApplication6.jar.

    However, when asked to run the program from the Netbeans environment, I get the i/o error because Netbeans is looking for the .jar file at
    \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\dist\run1270068608\JavaFXApplication6.jar


    Iíve included first the error message, and also the Java.io.File.class.

    Thanks in advance,
    Bill Sutherland
    Bill.l.sutherland@medtronic.com
    btsutherland@q.com




    Error Message:

    ant -f \\\\mspm1bnas03\\suthew1\\NetBeansProjects\\JavaFX Application6 "-Drun.jvmargs.ide= -javaagent:C:\\Users\\suthew1\\AppData\\Roaming\\Ne tBeans\\7.3\\jrebel\\jrebel.jar -Drebel.notification.url=http://localhost:55693 -Drebel.debugger_integration=false" jfxsa-run
    init:
    Deleting: \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\build\built-jar.properties
    deps-jar:
    Updating property file: \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\build\built-jar.properties
    compile:
    Detected JavaFX Ant API version 1.2
    jfx-deployment:
    jar:
    Copying 12 files to \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\dist\run1270068608
    jfx-project-run:
    Executing com.javafx.main.Main from \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\dist\run1270068608\JavaFXApplication6.jar using platform C:\Program Files\Java\jdk1.7.0_17/bin/java
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: ################################################## ###########
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: JRebel 5.2.2 (201304051638)
    2013-04-23 12:02:43 JRebel: (c) Copyright ZeroTurnaround OU, Estonia, Tartu.
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: Over the last 1 days JRebel prevented
    2013-04-23 12:02:43 JRebel: at least 0 redeploys/restarts saving you about 0 hours.
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: UNABLE TO INITIALIZE LICENSING - NO LICENSE FOUND
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: Please run JRebel Configuration Wizard to apply for
    2013-04-23 12:02:43 JRebel: evaluation license.
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: If you think you should not see this message contact
    2013-04-23 12:02:43 JRebel: support@zeroturnaround.com or check that you have your
    2013-04-23 12:02:43 JRebel: license file in the same directory as the JAR file.
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: The following plugins are disabled at the moment:
    2013-04-23 12:02:43 JRebel: * ADF Core plugin (set -Drebel.adf_core_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * ADF Faces plugin (set -Drebel.adf_faces_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Camel plugin (set -Drebel.camel_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Click plugin (set -Drebel.click_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * JRuby Plugin (set -Drebel.jruby_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Jersey plugin (set -Drebel.jersey_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Log4j2 plugin (set -Drebel.log4j2_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Mustache Plugin (set -Drebel.mustache_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * RESTlet plugin (set -Drebel.restlet_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Seam-Wicket plugin (set -Drebel.seam_wicket_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Spring Data Plugin (set -Drebel.spring_data_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Thymeleaf Plugin (set -Drebel.thymeleaf_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * VRaptor plugin (set -Drebel.vraptor_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * Vaadin CDI utils plugin (set -Drebel.vaadin_cdiutils_plugin=true to enable)
    2013-04-23 12:02:43 JRebel: * WebObjects plugin (set -Drebel.webobjects_plugin=true to enable)
    2013-04-23 12:02:43 JRebel:
    2013-04-23 12:02:43 JRebel: ################################################## ###########
    2013-04-23 12:02:43 JRebel:
    java.io.FileNotFoundException: \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\suthew1\NetBeansProjects\JavaFXApplication 6\dist\run1270068608\JavaFXApplication6.jar (The system cannot find the path specified)
    at java.util.zip.ZipFile.open(Native Method)
    at java.util.zip.ZipFile.<init>(ZipFile.java:214)
    at java.util.zip.ZipFile.<init>(ZipFile.java:144)
    at java.util.jar.JarFile.<init>(JarFile.java:153)
    at java.util.jar.JarFile.<init>(JarFile.java:90)
    at com.javafx.main.Main.getJarAttributes(Main.java:40 7)
    at com.javafx.main.Main.main(Main.java:763)
    Java Result: 1
    Deleting directory \\mspm1bnas03\suthew1\NetBeansProjects\JavaFXAppli cation6\dist\run1270068608
    jfxsa-run:
    BUILD SUCCESSFUL (total time: 10 seconds)



    code=Java



    Java.io.File.class


    /*
    * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
    * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    *
    */

    package java.io;

    import java.net.URI;
    import java.net.URL;
    import java.net.MalformedURLException;
    import java.net.URISyntaxException;
    import java.util.List;
    import java.util.ArrayList;
    import java.security.AccessController;
    import java.security.SecureRandom;
    import java.nio.file.Path;
    import java.nio.file.FileSystems;
    import sun.security.action.GetPropertyAction;

    /**
    * An abstract representation of file and directory pathnames.
    *
    * <p> User interfaces and operating systems use system-dependent <em>pathname
    * strings</em> to name files and directories. This class presents an
    * abstract, system-independent view of hierarchical pathnames. An
    * <em>abstract pathname</em> has two components:
    *
    * <ol>
    * <li> An optional system-dependent <em>prefix</em> string,
    * such as a disk-drive specifier, <code>"/"</code>&nbsp;for the UNIX root
    * directory, or <code>"\\\\"</code>&nbsp;for a Microsoft Windows UNC pathname, and
    * <li> A sequence of zero or more string <em>names</em>.
    * </ol>
    *
    * The first name in an abstract pathname may be a directory name or, in the
    * case of Microsoft Windows UNC pathnames, a hostname. Each subsequent name
    * in an abstract pathname denotes a directory; the last name may denote
    * either a directory or a file. The <em>empty</em> abstract pathname has no
    * prefix and an empty name sequence.
    *
    * <p> The conversion of a pathname string to or from an abstract pathname is
    * inherently system-dependent. When an abstract pathname is converted into a
    * pathname string, each name is separated from the next by a single copy of
    * the default <em>separator character</em>. The default name-separator
    * character is defined by the system property <code>file.separator</code>, and
    * is made available in the public static fields <code>{@link
    * #separator}</code> and <code>{@link #separatorChar}</code> of this class.
    * When a pathname string is converted into an abstract pathname, the names
    * within it may be separated by the default name-separator character or by any
    * other name-separator character that is supported by the underlying system.
    *
    * <p> A pathname, whether abstract or in string form, may be either
    * <em>absolute</em> or <em>relative</em>. An absolute pathname is complete in
    * that no other information is required in order to locate the file that it
    * denotes. A relative pathname, in contrast, must be interpreted in terms of
    * information taken from some other pathname. By default the classes in the
    * <code>java.io</code> package always resolve relative pathnames against the
    * current user directory. This directory is named by the system property
    * <code>user.dir</code>, and is typically the directory in which the Java
    * virtual machine was invoked.
    *
    * <p> The <em>parent</em> of an abstract pathname may be obtained by invoking
    * the {@link #getParent} method of this class and consists of the pathname's
    * prefix and each name in the pathname's name sequence except for the last.
    * Each directory's absolute pathname is an ancestor of any <tt>File</tt>
    * object with an absolute abstract pathname which begins with the directory's
    * absolute pathname. For example, the directory denoted by the abstract
    * pathname <tt>"/usr"</tt> is an ancestor of the directory denoted by the
    * pathname <tt>"/usr/local/bin"</tt>.
    *
    * <p> The prefix concept is used to handle root directories on UNIX platforms,
    * and drive specifiers, root directories and UNC pathnames on Microsoft Windows platforms,
    * as follows:
    *
    * <ul>
    *
    * <li> For UNIX platforms, the prefix of an absolute pathname is always
    * <code>"/"</code>. Relative pathnames have no prefix. The abstract pathname
    * denoting the root directory has the prefix <code>"/"</code> and an empty
    * name sequence.
    *
    * <li> For Microsoft Windows platforms, the prefix of a pathname that contains a drive
    * specifier consists of the drive letter followed by <code>":"</code> and
    * possibly followed by <code>"\\"</code> if the pathname is absolute. The
    * prefix of a UNC pathname is <code>"\\\\"</code>; the hostname and the share
    * name are the first two names in the name sequence. A relative pathname that
    * does not specify a drive has no prefix.
    *
    * </ul>
    *
    * <p> Instances of this class may or may not denote an actual file-system
    * object such as a file or a directory. If it does denote such an object
    * then that object resides in a <i>partition</i>. A partition is an
    * operating system-specific portion of storage for a file system. A single
    * storage device (e.g. a physical disk-drive, flash memory, CD-ROM) may
    * contain multiple partitions. The object, if any, will reside on the
    * partition <a name="partName">named</a> by some ancestor of the absolute
    * form of this pathname.
    *
    * <p> A file system may implement restrictions to certain operations on the
    * actual file-system object, such as reading, writing, and executing. These
    * restrictions are collectively known as <i>access permissions</i>. The file
    * system may have multiple sets of access permissions on a single object.
    * For example, one set may apply to the object's <i>owner</i>, and another
    * may apply to all other users. The access permissions on an object may
    * cause some methods in this class to fail.
    *
    * <p> Instances of the <code>File</code> class are immutable; that is, once
    * created, the abstract pathname represented by a <code>File</code> object
    * will never change.
    *
    * <h4>Interoperability with {@code java.nio.file} package</h4>
    *
    * <p> The <a href="../../java/nio/file/package-summary.html">{@code java.nio.file}</a>
    * package defines interfaces and classes for the Java virtual machine to access
    * files, file attributes, and file systems. This API may be used to overcome
    * many of the limitations of the {@code java.io.File} class.
    * The {@link #toPath toPath} method may be used to obtain a {@link
    * Path} that uses the abstract path represented by a {@code File} object to
    * locate a file. The resulting {@code Path} may be used with the {@link
    * java.nio.file.Files} class to provide more efficient and extensive access to
    * additional file operations, file attributes, and I/O exceptions to help
    * diagnose errors when an operation on a file fails.
    *
    * @author unascribed
    * @since JDK1.0
    */

    public class File
    implements Serializable, Comparable<File>
    {

    /**
    * The FileSystem object representing the platform's local file system.
    */
    static private FileSystem fs = FileSystem.getFileSystem();

    /**
    * This abstract pathname's normalized pathname string. A normalized
    * pathname string uses the default name-separator character and does not
    * contain any duplicate or redundant separators.
    *
    * @serial
    */
    private String path;

    /**
    * The length of this abstract pathname's prefix, or zero if it has no
    * prefix.
    */
    private transient int prefixLength;

    /**
    * Returns the length of this abstract pathname's prefix.
    * For use by FileSystem classes.
    */
    int getPrefixLength() {
    return prefixLength;
    }

    /**
    * The system-dependent default name-separator character. This field is
    * initialized to contain the first character of the value of the system
    * property <code>file.separator</code>. On UNIX systems the value of this
    * field is <code>'/'</code>; on Microsoft Windows systems it is <code>'\\'</code>.
    *
    * @see java.lang.System#getProperty(java.lang.String)
    */
    public static final char separatorChar = fs.getSeparator();

    /**
    * The system-dependent default name-separator character, represented as a
    * string for convenience. This string contains a single character, namely
    * <code>{@link #separatorChar}</code>.
    */
    public static final String separator = "" + separatorChar;

    /**
    * The system-dependent path-separator character. This field is
    * initialized to contain the first character of the value of the system
    * property <code>path.separator</code>. This character is used to
    * separate filenames in a sequence of files given as a <em>path list</em>.
    * On UNIX systems, this character is <code>':'</code>; on Microsoft Windows systems it
    * is <code>';'</code>.
    *
    * @see java.lang.System#getProperty(java.lang.String)
    */
    public static final char pathSeparatorChar = fs.getPathSeparator();

    /**
    * The system-dependent path-separator character, represented as a string
    * for convenience. This string contains a single character, namely
    * <code>{@link #pathSeparatorChar}</code>.
    */
    public static final String pathSeparator = "" + pathSeparatorChar;


    /* -- Constructors -- */

    /**
    * Internal constructor for already-normalized pathname strings.
    */
    private File(String pathname, int prefixLength) {
    this.path = pathname;
    this.prefixLength = prefixLength;
    }

    /**
    * Internal constructor for already-normalized pathname strings.
    * The parameter order is used to disambiguate this method from the
    * public(File, String) constructor.
    */
    private File(String child, File parent) {
    assert parent.path != null;
    assert (!parent.path.equals(""));
    this.path = fs.resolve(parent.path, child);
    this.prefixLength = parent.prefixLength;
    }

    /**
    * Creates a new <code>File</code> instance by converting the given
    * pathname string into an abstract pathname. If the given string is
    * the empty string, then the result is the empty abstract pathname.
    *
    * @param pathname A pathname string
    * @throws NullPointerException
    * If the <code>pathname</code> argument is <code>null</code>
    */
    public File(String pathname) {
    if (pathname == null) {
    throw new NullPointerException();
    }
    this.path = fs.normalize(pathname);
    this.prefixLength = fs.prefixLength(this.path);
    }

    /* Note: The two-argument File constructors do not interpret an empty
    parent abstract pathname as the current user directory. An empty parent
    instead causes the child to be resolved against the system-dependent
    directory defined by the FileSystem.getDefaultParent method. On Unix
    this default is "/", while on Microsoft Windows it is "\\". This is required for
    compatibility with the original behavior of this class. */

    /**
    * Creates a new <code>File</code> instance from a parent pathname string
    * and a child pathname string.
    *
    * <p> If <code>parent</code> is <code>null</code> then the new
    * <code>File</code> instance is created as if by invoking the
    * single-argument <code>File</code> constructor on the given
    * <code>child</code> pathname string.
    *
    * <p> Otherwise the <code>parent</code> pathname string is taken to denote
    * a directory, and the <code>child</code> pathname string is taken to
    * denote either a directory or a file. If the <code>child</code> pathname
    * string is absolute then it is converted into a relative pathname in a
    * system-dependent way. If <code>parent</code> is the empty string then
    * the new <code>File</code> instance is created by converting
    * <code>child</code> into an abstract pathname and resolving the result
    * against a system-dependent default directory. Otherwise each pathname
    * string is converted into an abstract pathname and the child abstract
    * pathname is resolved against the parent.
    *
    * @param parent The parent pathname string
    * @param child The child pathname string
    * @throws NullPointerException
    * If <code>child</code> is <code>null</code>
    */
    public File(String parent, String child) {
    if (child == null) {
    throw new NullPointerException();
    }
    if (parent != null) {
    if (parent.equals("")) {
    this.path = fs.resolve(fs.getDefaultParent(),
    fs.normalize(child));
    } else {
    this.path = fs.resolve(fs.normalize(parent),
    fs.normalize(child));
    }
    } else {
    this.path = fs.normalize(child);
    }
    this.prefixLength = fs.prefixLength(this.path);
    }

    /**
    * Creates a new <code>File</code> instance from a parent abstract
    * pathname and a child pathname string.
    *
    * <p> If <code>parent</code> is <code>null</code> then the new
    * <code>File</code> instance is created as if by invoking the
    * single-argument <code>File</code> constructor on the given
    * <code>child</code> pathname string.
    *
    * <p> Otherwise the <code>parent</code> abstract pathname is taken to
    * denote a directory, and the <code>child</code> pathname string is taken
    * to denote either a directory or a file. If the <code>child</code>
    * pathname string is absolute then it is converted into a relative
    * pathname in a system-dependent way. If <code>parent</code> is the empty
    * abstract pathname then the new <code>File</code> instance is created by
    * converting <code>child</code> into an abstract pathname and resolving
    * the result against a system-dependent default directory. Otherwise each
    * pathname string is converted into an abstract pathname and the child
    * abstract pathname is resolved against the parent.
    *
    * @param parent The parent abstract pathname
    * @param child The child pathname string
    * @throws NullPointerException
    * If <code>child</code> is <code>null</code>
    */
    public File(File parent, String child) {
    if (child == null) {
    throw new NullPointerException();
    }
    if (parent != null) {
    if (parent.path.equals("")) {
    this.path = fs.resolve(fs.getDefaultParent(),
    fs.normalize(child));
    } else {
    this.path = fs.resolve(parent.path,
    fs.normalize(child));
    }
    } else {
    this.path = fs.normalize(child);
    }
    this.prefixLength = fs.prefixLength(this.path);
    }

    /**
    * Creates a new <tt>File</tt> instance by converting the given
    * <tt>file:</tt> URI into an abstract pathname.
    *
    * <p> The exact form of a <tt>file:</tt> URI is system-dependent, hence
    * the transformation performed by this constructor is also
    * system-dependent.
    *
    * <p> For a given abstract pathname <i>f</i> it is guaranteed that
    *
    * <blockquote><tt>
    * new File(</tt><i>&nbsp;f</i><tt>.{@link #toURI() toURI}()).equals(</tt><i>&nbsp;f</i><tt>.{@link #getAbsoluteFile() getAbsoluteFile}())
    * </tt></blockquote>
    *
    * so long as the original abstract pathname, the URI, and the new abstract
    * pathname are all created in (possibly different invocations of) the same
    * Java virtual machine. This relationship typically does not hold,
    * however, when a <tt>file:</tt> URI that is created in a virtual machine
    * on one operating system is converted into an abstract pathname in a
    * virtual machine on a different operating system.
    *
    * @param uri
    * An absolute, hierarchical URI with a scheme equal to
    * <tt>"file"</tt>, a non-empty path component, and undefined
    * authority, query, and fragment components
    *
    * @throws NullPointerException
    * If <tt>uri</tt> is <tt>null</tt>
    *
    * @throws IllegalArgumentException
    * If the preconditions on the parameter do not hold
    *
    * @see #toURI()
    * @see java.net.URI
    * @since 1.4
    */
    public File(URI uri) {

    // Check our many preconditions
    if (!uri.isAbsolute())
    throw new IllegalArgumentException("URI is not absolute");
    if (uri.isOpaque())
    throw new IllegalArgumentException("URI is not hierarchical");
    String scheme = uri.getScheme();
    if ((scheme == null) || !scheme.equalsIgnoreCase("file"))
    throw new IllegalArgumentException("URI scheme is not \"file\"");
    if (uri.getAuthority() != null)
    throw new IllegalArgumentException("URI has an authority component");
    if (uri.getFragment() != null)
    throw new IllegalArgumentException("URI has a fragment component");
    if (uri.getQuery() != null)
    throw new IllegalArgumentException("URI has a query component");
    String p = uri.getPath();
    if (p.equals(""))
    throw new IllegalArgumentException("URI path component is empty");

    // Okay, now initialize
    p = fs.fromURIPath(p);
    if (File.separatorChar != '/')
    p = p.replace('/', File.separatorChar);
    this.path = fs.normalize(p);
    this.prefixLength = fs.prefixLength(this.path);
    }


    /* -- Path-component accessors -- */

    /**
    * Returns the name of the file or directory denoted by this abstract
    * pathname. This is just the last name in the pathname's name
    * sequence. If the pathname's name sequence is empty, then the empty
    * string is returned.
    *
    * @return The name of the file or directory denoted by this abstract
    * pathname, or the empty string if this pathname's name sequence
    * is empty
    */
    public String getName() {
    int index = path.lastIndexOf(separatorChar);
    if (index < prefixLength) return path.substring(prefixLength);
    return path.substring(index + 1);
    }

    /**
    * Returns the pathname string of this abstract pathname's parent, or
    * <code>null</code> if this pathname does not name a parent directory.
    *
    * <p> The <em>parent</em> of an abstract pathname consists of the
    * pathname's prefix, if any, and each name in the pathname's name
    * sequence except for the last. If the name sequence is empty then
    * the pathname does not name a parent directory.
    *
    * @return The pathname string of the parent directory named by this
    * abstract pathname, or <code>null</code> if this pathname
    * does not name a parent
    */
    public String getParent() {
    int index = path.lastIndexOf(separatorChar);
    if (index < prefixLength) {
    if ((prefixLength > 0) && (path.length() > prefixLength))
    return path.substring(0, prefixLength);
    return null;
    }
    return path.substring(0, index);
    }

    /**
    * Returns the abstract pathname of this abstract pathname's parent,
    * or <code>null</code> if this pathname does not name a parent
    * directory.
    *
    * <p> The <em>parent</em> of an abstract pathname consists of the
    * pathname's prefix, if any, and each name in the pathname's name
    * sequence except for the last. If the name sequence is empty then
    * the pathname does not name a parent directory.
    *
    * @return The abstract pathname of the parent directory named by this
    * abstract pathname, or <code>null</code> if this pathname
    * does not name a parent
    *
    * @since 1.2
    */
    public File getParentFile() {
    String p = this.getParent();
    if (p == null) return null;
    return new File(p, this.prefixLength);
    }

    /**
    * Converts this abstract pathname into a pathname string. The resulting
    * string uses the {@link #separator default name-separator character} to
    * separate the names in the name sequence.
    *
    * @return The string form of this abstract pathname
    */
    public String getPath() {
    return path;
    }


    /* -- Path operations -- */

    /**
    * Tests whether this abstract pathname is absolute. The definition of
    * absolute pathname is system dependent. On UNIX systems, a pathname is
    * absolute if its prefix is <code>"/"</code>. On Microsoft Windows systems, a
    * pathname is absolute if its prefix is a drive specifier followed by
    * <code>"\\"</code>, or if its prefix is <code>"\\\\"</code>.
    *
    * @return <code>true</code> if this abstract pathname is absolute,
    * <code>false</code> otherwise
    */
    public boolean isAbsolute() {
    return fs.isAbsolute(this);
    }

    /**
    * Returns the absolute pathname string of this abstract pathname.
    *
    * <p> If this abstract pathname is already absolute, then the pathname
    * string is simply returned as if by the <code>{@link #getPath}</code>
    * method. If this abstract pathname is the empty abstract pathname then
    * the pathname string of the current user directory, which is named by the
    * system property <code>user.dir</code>, is returned. Otherwise this
    * pathname is resolved in a system-dependent way. On UNIX systems, a
    * relative pathname is made absolute by resolving it against the current
    * user directory. On Microsoft Windows systems, a relative pathname is made absolute
    * by resolving it against the current directory of the drive named by the
    * pathname, if any; if not, it is resolved against the current user
    * directory.
    *
    * @return The absolute pathname string denoting the same file or
    * directory as this abstract pathname
    *
    * @throws SecurityException
    * If a required system property value cannot be accessed.
    *
    * @see java.io.File#isAbsolute()
    */
    public String getAbsolutePath() {
    return fs.resolve(this);
    }

    /**
    * Returns the absolute form of this abstract pathname. Equivalent to
    * <code>new&nbsp;File(this.{@link #getAbsolutePath})</code>.
    *
    * @return The absolute abstract pathname denoting the same file or
    * directory as this abstract pathname
    *
    * @throws SecurityException
    * If a required system property value cannot be accessed.
    *
    * @since 1.2
    */
    public File getAbsoluteFile() {
    String absPath = getAbsolutePath();
    return new File(absPath, fs.prefixLength(absPath));
    }

    /**
    * Returns the canonical pathname string of this abstract pathname.
    *
    * <p> A canonical pathname is both absolute and unique. The precise
    * definition of canonical form is system-dependent. This method first
    * converts this pathname to absolute form if necessary, as if by invoking the
    * {@link #getAbsolutePath} method, and then maps it to its unique form in a
    * system-dependent way. This typically involves removing redundant names
    * such as <tt>"."</tt> and <tt>".."</tt> from the pathname, resolving
    * symbolic links (on UNIX platforms), and converting drive letters to a
    * standard case (on Microsoft Windows platforms).
    *
    * <p> Every pathname that denotes an existing file or directory has a
    * unique canonical form. Every pathname that denotes a nonexistent file
    * or directory also has a unique canonical form. The canonical form of
    * the pathname of a nonexistent file or directory may be different from
    * the canonical form of the same pathname after the file or directory is
    * created. Similarly, the canonical form of the pathname of an existing
    * file or directory may be different from the canonical form of the same
    * pathname after the file or directory is deleted.
    *
    * @return The canonical pathname string denoting the same file or
    * directory as this abstract pathname
    *
    * @throws IOException
    * If an I/O error occurs, which is possible because the
    * construction of the canonical pathname may require
    * filesystem queries
    *
    * @throws SecurityException
    * If a required system property value cannot be accessed, or
    * if a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead}</code> method denies
    * read access to the file
    *
    * @since JDK1.1
    * @see Path#toRealPath
    */
    public String getCanonicalPath() throws IOException {
    return fs.canonicalize(fs.resolve(this));
    }

    /**
    * Returns the canonical form of this abstract pathname. Equivalent to
    * <code>new&nbsp;File(this.{@link #getCanonicalPath})</code>.
    *
    * @return The canonical pathname string denoting the same file or
    * directory as this abstract pathname
    *
    * @throws IOException
    * If an I/O error occurs, which is possible because the
    * construction of the canonical pathname may require
    * filesystem queries
    *
    * @throws SecurityException
    * If a required system property value cannot be accessed, or
    * if a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead}</code> method denies
    * read access to the file
    *
    * @since 1.2
    * @see Path#toRealPath
    */
    public File getCanonicalFile() throws IOException {
    String canonPath = getCanonicalPath();
    return new File(canonPath, fs.prefixLength(canonPath));
    }

    private static String slashify(String path, boolean isDirectory) {
    String p = path;
    if (File.separatorChar != '/')
    p = p.replace(File.separatorChar, '/');
    if (!p.startsWith("/"))
    p = "/" + p;
    if (!p.endsWith("/") && isDirectory)
    p = p + "/";
    return p;
    }

    /**
    * Converts this abstract pathname into a <code>file:</code> URL. The
    * exact form of the URL is system-dependent. If it can be determined that
    * the file denoted by this abstract pathname is a directory, then the
    * resulting URL will end with a slash.
    *
    * @return A URL object representing the equivalent file URL
    *
    * @throws MalformedURLException
    * If the path cannot be parsed as a URL
    *
    * @see #toURI()
    * @see java.net.URI
    * @see java.net.URI#toURL()
    * @see java.net.URL
    * @since 1.2
    *
    * @deprecated This method does not automatically escape characters that
    * are illegal in URLs. It is recommended that new code convert an
    * abstract pathname into a URL by first converting it into a URI, via the
    * {@link #toURI() toURI} method, and then converting the URI into a URL
    * via the {@link java.net.URI#toURL() URI.toURL} method.
    */
    @Deprecated
    public URL toURL() throws MalformedURLException {
    return new URL("file", "", slashify(getAbsolutePath(), isDirectory()));
    }

    /**
    * Constructs a <tt>file:</tt> URI that represents this abstract pathname.
    *
    * <p> The exact form of the URI is system-dependent. If it can be
    * determined that the file denoted by this abstract pathname is a
    * directory, then the resulting URI will end with a slash.
    *
    * <p> For a given abstract pathname <i>f</i>, it is guaranteed that
    *
    * <blockquote><tt>
    * new {@link #File(java.net.URI) File}(</tt><i>&nbsp;f</i><tt>.toURI()).equals(</tt><i>&nbsp;f</i><tt>.{@link #getAbsoluteFile() getAbsoluteFile}())
    * </tt></blockquote>
    *
    * so long as the original abstract pathname, the URI, and the new abstract
    * pathname are all created in (possibly different invocations of) the same
    * Java virtual machine. Due to the system-dependent nature of abstract
    * pathnames, however, this relationship typically does not hold when a
    * <tt>file:</tt> URI that is created in a virtual machine on one operating
    * system is converted into an abstract pathname in a virtual machine on a
    * different operating system.
    *
    * <p> Note that when this abstract pathname represents a UNC pathname then
    * all components of the UNC (including the server name component) are encoded
    * in the {@code URI} path. The authority component is undefined, meaning
    * that it is represented as {@code null}. The {@link Path} class defines the
    * {@link Path#toUri toUri} method to encode the server name in the authority
    * component of the resulting {@code URI}. The {@link #toPath toPath} method
    * may be used to obtain a {@code Path} representing this abstract pathname.
    *
    * @return An absolute, hierarchical URI with a scheme equal to
    * <tt>"file"</tt>, a path representing this abstract pathname,
    * and undefined authority, query, and fragment components
    * @throws SecurityException If a required system property value cannot
    * be accessed.
    *
    * @see #File(java.net.URI)
    * @see java.net.URI
    * @see java.net.URI#toURL()
    * @since 1.4
    */
    public URI toURI() {
    try {
    File f = getAbsoluteFile();
    String sp = slashify(f.getPath(), f.isDirectory());
    if (sp.startsWith("//"))
    sp = "//" + sp;
    return new URI("file", null, sp, null);
    } catch (URISyntaxException x) {
    throw new Error(x); // Can't happen
    }
    }


    /* -- Attribute accessors -- */

    /**
    * Tests whether the application can read the file denoted by this
    * abstract pathname.
    *
    * @return <code>true</code> if and only if the file specified by this
    * abstract pathname exists <em>and</em> can be read by the
    * application; <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    */
    public boolean canRead() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return fs.checkAccess(this, FileSystem.ACCESS_READ);
    }

    /**
    * Tests whether the application can modify the file denoted by this
    * abstract pathname.
    *
    * @return <code>true</code> if and only if the file system actually
    * contains a file denoted by this abstract pathname <em>and</em>
    * the application is allowed to write to the file;
    * <code>false</code> otherwise.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    */
    public boolean canWrite() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.checkAccess(this, FileSystem.ACCESS_WRITE);
    }

    /**
    * Tests whether the file or directory denoted by this abstract pathname
    * exists.
    *
    * @return <code>true</code> if and only if the file or directory denoted
    * by this abstract pathname exists; <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file or directory
    */
    public boolean exists() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return ((fs.getBooleanAttributes(this) & FileSystem.BA_EXISTS) != 0);
    }

    /**
    * Tests whether the file denoted by this abstract pathname is a
    * directory.
    *
    * <p> Where it is required to distinguish an I/O exception from the case
    * that the file is not a directory, or where several attributes of the
    * same file are required at the same time, then the {@link
    * java.nio.file.Files#readAttributes(Path,Class,Link Option[])
    * Files.readAttributes} method may be used.
    *
    * @return <code>true</code> if and only if the file denoted by this
    * abstract pathname exists <em>and</em> is a directory;
    * <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    */
    public boolean isDirectory() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return ((fs.getBooleanAttributes(this) & FileSystem.BA_DIRECTORY)
    != 0);
    }

    /**
    * Tests whether the file denoted by this abstract pathname is a normal
    * file. A file is <em>normal</em> if it is not a directory and, in
    * addition, satisfies other system-dependent criteria. Any non-directory
    * file created by a Java application is guaranteed to be a normal file.
    *
    * <p> Where it is required to distinguish an I/O exception from the case
    * that the file is not a normal file, or where several attributes of the
    * same file are required at the same time, then the {@link
    * java.nio.file.Files#readAttributes(Path,Class,Link Option[])
    * Files.readAttributes} method may be used.
    *
    * @return <code>true</code> if and only if the file denoted by this
    * abstract pathname exists <em>and</em> is a normal file;
    * <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    */
    public boolean isFile() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return ((fs.getBooleanAttributes(this) & FileSystem.BA_REGULAR) != 0);
    }

    /**
    * Tests whether the file named by this abstract pathname is a hidden
    * file. The exact definition of <em>hidden</em> is system-dependent. On
    * UNIX systems, a file is considered to be hidden if its name begins with
    * a period character (<code>'.'</code>). On Microsoft Windows systems, a file is
    * considered to be hidden if it has been marked as such in the filesystem.
    *
    * @return <code>true</code> if and only if the file denoted by this
    * abstract pathname is hidden according to the conventions of the
    * underlying platform
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    *
    * @since 1.2
    */
    public boolean isHidden() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return ((fs.getBooleanAttributes(this) & FileSystem.BA_HIDDEN) != 0);
    }

    /**
    * Returns the time that the file denoted by this abstract pathname was
    * last modified.
    *
    * <p> Where it is required to distinguish an I/O exception from the case
    * where {@code 0L} is returned, or where several attributes of the
    * same file are required at the same time, or where the time of last
    * access or the creation time are required, then the {@link
    * java.nio.file.Files#readAttributes(Path,Class,Link Option[])
    * Files.readAttributes} method may be used.
    *
    * @return A <code>long</code> value representing the time the file was
    * last modified, measured in milliseconds since the epoch
    * (00:00:00 GMT, January 1, 1970), or <code>0L</code> if the
    * file does not exist or if an I/O error occurs
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    */
    public long lastModified() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return fs.getLastModifiedTime(this);
    }

    /**
    * Returns the length of the file denoted by this abstract pathname.
    * The return value is unspecified if this pathname denotes a directory.
    *
    * <p> Where it is required to distinguish an I/O exception from the case
    * that {@code 0L} is returned, or where several attributes of the same file
    * are required at the same time, then the {@link
    * java.nio.file.Files#readAttributes(Path,Class,Link Option[])
    * Files.readAttributes} method may be used.
    *
    * @return The length, in bytes, of the file denoted by this abstract
    * pathname, or <code>0L</code> if the file does not exist. Some
    * operating systems may return <code>0L</code> for pathnames
    * denoting system-dependent entities such as devices or pipes.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method denies read access to the file
    */
    public long length() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return fs.getLength(this);
    }


    /* -- File operations -- */

    /**
    * Atomically creates a new, empty file named by this abstract pathname if
    * and only if a file with this name does not yet exist. The check for the
    * existence of the file and the creation of the file if it does not exist
    * are a single operation that is atomic with respect to all other
    * filesystem activities that might affect the file.
    * <P>
    * Note: this method should <i>not</i> be used for file-locking, as
    * the resulting protocol cannot be made to work reliably. The
    * {@link java.nio.channels.FileLock FileLock}
    * facility should be used instead.
    *
    * @return <code>true</code> if the named file does not exist and was
    * successfully created; <code>false</code> if the named file
    * already exists
    *
    * @throws IOException
    * If an I/O error occurred
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.2
    */
    public boolean createNewFile() throws IOException {
    SecurityManager security = System.getSecurityManager();
    if (security != null) security.checkWrite(path);
    return fs.createFileExclusively(path);
    }

    /**
    * Deletes the file or directory denoted by this abstract pathname. If
    * this pathname denotes a directory, then the directory must be empty in
    * order to be deleted.
    *
    * <p> Note that the {@link java.nio.file.Files} class defines the {@link
    * java.nio.file.Files#delete(Path) delete} method to throw an {@link IOException}
    * when a file cannot be deleted. This is useful for error reporting and to
    * diagnose why a file cannot be deleted.
    *
    * @return <code>true</code> if and only if the file or directory is
    * successfully deleted; <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkDelete}</code> method denies
    * delete access to the file
    */
    public boolean delete() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkDelete(path);
    }
    return fs.delete(this);
    }

    /**
    * Requests that the file or directory denoted by this abstract
    * pathname be deleted when the virtual machine terminates.
    * Files (or directories) are deleted in the reverse order that
    * they are registered. Invoking this method to delete a file or
    * directory that is already registered for deletion has no effect.
    * Deletion will be attempted only for normal termination of the
    * virtual machine, as defined by the Java Language Specification.
    *
    * <p> Once deletion has been requested, it is not possible to cancel the
    * request. This method should therefore be used with care.
    *
    * <P>
    * Note: this method should <i>not</i> be used for file-locking, as
    * the resulting protocol cannot be made to work reliably. The
    * {@link java.nio.channels.FileLock FileLock}
    * facility should be used instead.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkDelete}</code> method denies
    * delete access to the file
    *
    * @see #delete
    *
    * @since 1.2
    */
    public void deleteOnExit() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkDelete(path);
    }
    DeleteOnExitHook.add(path);
    }

    /**
    * Returns an array of strings naming the files and directories in the
    * directory denoted by this abstract pathname.
    *
    * <p> If this abstract pathname does not denote a directory, then this
    * method returns {@code null}. Otherwise an array of strings is
    * returned, one for each file or directory in the directory. Names
    * denoting the directory itself and the directory's parent directory are
    * not included in the result. Each string is a file name rather than a
    * complete path.
    *
    * <p> There is no guarantee that the name strings in the resulting array
    * will appear in any specific order; they are not, in particular,
    * guaranteed to appear in alphabetical order.
    *
    * <p> Note that the {@link java.nio.file.Files} class defines the {@link
    * java.nio.file.Files#newDirectoryStream(Path) newDirectoryStream} method to
    * open a directory and iterate over the names of the files in the directory.
    * This may use less resources when working with very large directories, and
    * may be more responsive when working with remote directories.
    *
    * @return An array of strings naming the files and directories in the
    * directory denoted by this abstract pathname. The array will be
    * empty if the directory is empty. Returns {@code null} if
    * this abstract pathname does not denote a directory, or if an
    * I/O error occurs.
    *
    * @throws SecurityException
    * If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to
    * the directory
    */
    public String[] list() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkRead(path);
    }
    return fs.list(this);
    }

    /**
    * Returns an array of strings naming the files and directories in the
    * directory denoted by this abstract pathname that satisfy the specified
    * filter. The behavior of this method is the same as that of the
    * {@link #list()} method, except that the strings in the returned array
    * must satisfy the filter. If the given {@code filter} is {@code null}
    * then all names are accepted. Otherwise, a name satisfies the filter if
    * and only if the value {@code true} results when the {@link
    * FilenameFilter#accept FilenameFilter.accept(File,&nbsp;String)} method
    * of the filter is invoked on this abstract pathname and the name of a
    * file or directory in the directory that it denotes.
    *
    * @param filter
    * A filename filter
    *
    * @return An array of strings naming the files and directories in the
    * directory denoted by this abstract pathname that were accepted
    * by the given {@code filter}. The array will be empty if the
    * directory is empty or if no names were accepted by the filter.
    * Returns {@code null} if this abstract pathname does not denote
    * a directory, or if an I/O error occurs.
    *
    * @throws SecurityException
    * If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to
    * the directory
    *
    * @see java.nio.file.Files#newDirectoryStream(Path,String )
    */
    public String[] list(FilenameFilter filter) {
    String names[] = list();
    if ((names == null) || (filter == null)) {
    return names;
    }
    List<String> v = new ArrayList<>();
    for (int i = 0 ; i < names.length ; i++) {
    if (filter.accept(this, names[i])) {
    v.add(names[i]);
    }
    }
    return v.toArray(new String[v.size()]);
    }

    /**
    * Returns an array of abstract pathnames denoting the files in the
    * directory denoted by this abstract pathname.
    *
    * <p> If this abstract pathname does not denote a directory, then this
    * method returns {@code null}. Otherwise an array of {@code File} objects
    * is returned, one for each file or directory in the directory. Pathnames
    * denoting the directory itself and the directory's parent directory are
    * not included in the result. Each resulting abstract pathname is
    * constructed from this abstract pathname using the {@link #File(File,
    * String) File(File,&nbsp;String)} constructor. Therefore if this
    * pathname is absolute then each resulting pathname is absolute; if this
    * pathname is relative then each resulting pathname will be relative to
    * the same directory.
    *
    * <p> There is no guarantee that the name strings in the resulting array
    * will appear in any specific order; they are not, in particular,
    * guaranteed to appear in alphabetical order.
    *
    * <p> Note that the {@link java.nio.file.Files} class defines the {@link
    * java.nio.file.Files#newDirectoryStream(Path) newDirectoryStream} method
    * to open a directory and iterate over the names of the files in the
    * directory. This may use less resources when working with very large
    * directories.
    *
    * @return An array of abstract pathnames denoting the files and
    * directories in the directory denoted by this abstract pathname.
    * The array will be empty if the directory is empty. Returns
    * {@code null} if this abstract pathname does not denote a
    * directory, or if an I/O error occurs.
    *
    * @throws SecurityException
    * If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to
    * the directory
    *
    * @since 1.2
    */
    public File[] listFiles() {
    String[] ss = list();
    if (ss == null) return null;
    int n = ss.length;
    File[] fs = new File[n];
    for (int i = 0; i < n; i++) {
    fs[i] = new File(ss[i], this);
    }
    return fs;
    }

    /**
    * Returns an array of abstract pathnames denoting the files and
    * directories in the directory denoted by this abstract pathname that
    * satisfy the specified filter. The behavior of this method is the same
    * as that of the {@link #listFiles()} method, except that the pathnames in
    * the returned array must satisfy the filter. If the given {@code filter}
    * is {@code null} then all pathnames are accepted. Otherwise, a pathname
    * satisfies the filter if and only if the value {@code true} results when
    * the {@link FilenameFilter#accept
    * FilenameFilter.accept(File,&nbsp;String)} method of the filter is
    * invoked on this abstract pathname and the name of a file or directory in
    * the directory that it denotes.
    *
    * @param filter
    * A filename filter
    *
    * @return An array of abstract pathnames denoting the files and
    * directories in the directory denoted by this abstract pathname.
    * The array will be empty if the directory is empty. Returns
    * {@code null} if this abstract pathname does not denote a
    * directory, or if an I/O error occurs.
    *
    * @throws SecurityException
    * If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to
    * the directory
    *
    * @since 1.2
    * @see java.nio.file.Files#newDirectoryStream(Path,String )
    */
    public File[] listFiles(FilenameFilter filter) {
    String ss[] = list();
    if (ss == null) return null;
    ArrayList<File> files = new ArrayList<>();
    for (String s : ss)
    if ((filter == null) || filter.accept(this, s))
    files.add(new File(s, this));
    return files.toArray(new File[files.size()]);
    }

    /**
    * Returns an array of abstract pathnames denoting the files and
    * directories in the directory denoted by this abstract pathname that
    * satisfy the specified filter. The behavior of this method is the same
    * as that of the {@link #listFiles()} method, except that the pathnames in
    * the returned array must satisfy the filter. If the given {@code filter}
    * is {@code null} then all pathnames are accepted. Otherwise, a pathname
    * satisfies the filter if and only if the value {@code true} results when
    * the {@link FileFilter#accept FileFilter.accept(File)} method of the
    * filter is invoked on the pathname.
    *
    * @param filter
    * A file filter
    *
    * @return An array of abstract pathnames denoting the files and
    * directories in the directory denoted by this abstract pathname.
    * The array will be empty if the directory is empty. Returns
    * {@code null} if this abstract pathname does not denote a
    * directory, or if an I/O error occurs.
    *
    * @throws SecurityException
    * If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to
    * the directory
    *
    * @since 1.2
    * @see java.nio.file.Files#newDirectoryStream(Path,java.n io.file.DirectoryStream.Filter)
    */
    public File[] listFiles(FileFilter filter) {
    String ss[] = list();
    if (ss == null) return null;
    ArrayList<File> files = new ArrayList<>();
    for (String s : ss) {
    File f = new File(s, this);
    if ((filter == null) || filter.accept(f))
    files.add(f);
    }
    return files.toArray(new File[files.size()]);
    }

    /**
    * Creates the directory named by this abstract pathname.
    *
    * @return <code>true</code> if and only if the directory was
    * created; <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method does not permit the named directory to be created
    */
    public boolean mkdir() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.createDirectory(this);
    }

    /**
    * Creates the directory named by this abstract pathname, including any
    * necessary but nonexistent parent directories. Note that if this
    * operation fails it may have succeeded in creating some of the necessary
    * parent directories.
    *
    * @return <code>true</code> if and only if the directory was created,
    * along with all necessary parent directories; <code>false</code>
    * otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkRead(java.lang.Stri ng)}</code>
    * method does not permit verification of the existence of the
    * named directory and all necessary parent directories; or if
    * the <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method does not permit the named directory and all necessary
    * parent directories to be created
    */
    public boolean mkdirs() {
    if (exists()) {
    return false;
    }
    if (mkdir()) {
    return true;
    }
    File canonFile = null;
    try {
    canonFile = getCanonicalFile();
    } catch (IOException e) {
    return false;
    }

    File parent = canonFile.getParentFile();
    return (parent != null && (parent.mkdirs() || parent.exists()) &&
    canonFile.mkdir());
    }

    /**
    * Renames the file denoted by this abstract pathname.
    *
    * <p> Many aspects of the behavior of this method are inherently
    * platform-dependent: The rename operation might not be able to move a
    * file from one filesystem to another, it might not be atomic, and it
    * might not succeed if a file with the destination abstract pathname
    * already exists. The return value should always be checked to make sure
    * that the rename operation was successful.
    *
    * <p> Note that the {@link java.nio.file.Files} class defines the {@link
    * java.nio.file.Files#move move} method to move or rename a file in a
    * platform independent manner.
    *
    * @param dest The new abstract pathname for the named file
    *
    * @return <code>true</code> if and only if the renaming succeeded;
    * <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to either the old or new pathnames
    *
    * @throws NullPointerException
    * If parameter <code>dest</code> is <code>null</code>
    */
    public boolean renameTo(File dest) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    security.checkWrite(dest.path);
    }
    return fs.rename(this, dest);
    }

    /**
    * Sets the last-modified time of the file or directory named by this
    * abstract pathname.
    *
    * <p> All platforms support file-modification times to the nearest second,
    * but some provide more precision. The argument will be truncated to fit
    * the supported precision. If the operation succeeds and no intervening
    * operations on the file take place, then the next invocation of the
    * <code>{@link #lastModified}</code> method will return the (possibly
    * truncated) <code>time</code> argument that was passed to this method.
    *
    * @param time The new last-modified time, measured in milliseconds since
    * the epoch (00:00:00 GMT, January 1, 1970)
    *
    * @return <code>true</code> if and only if the operation succeeded;
    * <code>false</code> otherwise
    *
    * @throws IllegalArgumentException If the argument is negative
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the named file
    *
    * @since 1.2
    */
    public boolean setLastModified(long time) {
    if (time < 0) throw new IllegalArgumentException("Negative time");
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.setLastModifiedTime(this, time);
    }

    /**
    * Marks the file or directory named by this abstract pathname so that
    * only read operations are allowed. After invoking this method the file
    * or directory is guaranteed not to change until it is either deleted or
    * marked to allow write access. Whether or not a read-only file or
    * directory may be deleted depends upon the underlying system.
    *
    * @return <code>true</code> if and only if the operation succeeded;
    * <code>false</code> otherwise
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the named file
    *
    * @since 1.2
    */
    public boolean setReadOnly() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.setReadOnly(this);
    }

    /**
    * Sets the owner's or everybody's write permission for this abstract
    * pathname.
    *
    * <p> The {@link java.nio.file.Files} class defines methods that operate on
    * file attributes including file permissions. This may be used when finer
    * manipulation of file permissions is required.
    *
    * @param writable
    * If <code>true</code>, sets the access permission to allow write
    * operations; if <code>false</code> to disallow write operations
    *
    * @param ownerOnly
    * If <code>true</code>, the write permission applies only to the
    * owner's write permission; otherwise, it applies to everybody. If
    * the underlying file system can not distinguish the owner's write
    * permission from that of others, then the permission will apply to
    * everybody, regardless of this value.
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to change
    * the access permissions of this abstract pathname.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the named file
    *
    * @since 1.6
    */
    public boolean setWritable(boolean writable, boolean ownerOnly) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.setPermission(this, FileSystem.ACCESS_WRITE, writable, ownerOnly);
    }

    /**
    * A convenience method to set the owner's write permission for this abstract
    * pathname.
    *
    * <p> An invocation of this method of the form <tt>file.setWritable(arg)</tt>
    * behaves in exactly the same way as the invocation
    *
    * <pre>
    * file.setWritable(arg, true) </pre>
    *
    * @param writable
    * If <code>true</code>, sets the access permission to allow write
    * operations; if <code>false</code> to disallow write operations
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to
    * change the access permissions of this abstract pathname.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.6
    */
    public boolean setWritable(boolean writable) {
    return setWritable(writable, true);
    }

    /**
    * Sets the owner's or everybody's read permission for this abstract
    * pathname.
    *
    * <p> The {@link java.nio.file.Files} class defines methods that operate on
    * file attributes including file permissions. This may be used when finer
    * manipulation of file permissions is required.
    *
    * @param readable
    * If <code>true</code>, sets the access permission to allow read
    * operations; if <code>false</code> to disallow read operations
    *
    * @param ownerOnly
    * If <code>true</code>, the read permission applies only to the
    * owner's read permission; otherwise, it applies to everybody. If
    * the underlying file system can not distinguish the owner's read
    * permission from that of others, then the permission will apply to
    * everybody, regardless of this value.
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to
    * change the access permissions of this abstract pathname. If
    * <code>readable</code> is <code>false</code> and the underlying
    * file system does not implement a read permission, then the
    * operation will fail.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.6
    */
    public boolean setReadable(boolean readable, boolean ownerOnly) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.setPermission(this, FileSystem.ACCESS_READ, readable, ownerOnly);
    }

    /**
    * A convenience method to set the owner's read permission for this abstract
    * pathname.
    *
    * <p>An invocation of this method of the form <tt>file.setReadable(arg)</tt>
    * behaves in exactly the same way as the invocation
    *
    * <pre>
    * file.setReadable(arg, true) </pre>
    *
    * @param readable
    * If <code>true</code>, sets the access permission to allow read
    * operations; if <code>false</code> to disallow read operations
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to
    * change the access permissions of this abstract pathname. If
    * <code>readable</code> is <code>false</code> and the underlying
    * file system does not implement a read permission, then the
    * operation will fail.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.6
    */
    public boolean setReadable(boolean readable) {
    return setReadable(readable, true);
    }

    /**
    * Sets the owner's or everybody's execute permission for this abstract
    * pathname.
    *
    * <p> The {@link java.nio.file.Files} class defines methods that operate on
    * file attributes including file permissions. This may be used when finer
    * manipulation of file permissions is required.
    *
    * @param executable
    * If <code>true</code>, sets the access permission to allow execute
    * operations; if <code>false</code> to disallow execute operations
    *
    * @param ownerOnly
    * If <code>true</code>, the execute permission applies only to the
    * owner's execute permission; otherwise, it applies to everybody.
    * If the underlying file system can not distinguish the owner's
    * execute permission from that of others, then the permission will
    * apply to everybody, regardless of this value.
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to
    * change the access permissions of this abstract pathname. If
    * <code>executable</code> is <code>false</code> and the underlying
    * file system does not implement an execute permission, then the
    * operation will fail.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.6
    */
    public boolean setExecutable(boolean executable, boolean ownerOnly) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkWrite(path);
    }
    return fs.setPermission(this, FileSystem.ACCESS_EXECUTE, executable, ownerOnly);
    }

    /**
    * A convenience method to set the owner's execute permission for this abstract
    * pathname.
    *
    * <p>An invocation of this method of the form <tt>file.setExcutable(arg)</tt>
    * behaves in exactly the same way as the invocation
    *
    * <pre>
    * file.setExecutable(arg, true) </pre>
    *
    * @param executable
    * If <code>true</code>, sets the access permission to allow execute
    * operations; if <code>false</code> to disallow execute operations
    *
    * @return <code>true</code> if and only if the operation succeeded. The
    * operation will fail if the user does not have permission to
    * change the access permissions of this abstract pathname. If
    * <code>executable</code> is <code>false</code> and the underlying
    * file system does not implement an excute permission, then the
    * operation will fail.
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method denies write access to the file
    *
    * @since 1.6
    */
    public boolean setExecutable(boolean executable) {
    return setExecutable(executable, true);
    }

    /**
    * Tests whether the application can execute the file denoted by this
    * abstract pathname.
    *
    * @return <code>true</code> if and only if the abstract pathname exists
    * <em>and</em> the application is allowed to execute the file
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkExec(java.lang.Stri ng)}</code>
    * method denies execute access to the file
    *
    * @since 1.6
    */
    public boolean canExecute() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
    security.checkExec(path);
    }
    return fs.checkAccess(this, FileSystem.ACCESS_EXECUTE);
    }


    /* -- Filesystem interface -- */

    /**
    * List the available filesystem roots.
    *
    * <p> A particular Java platform may support zero or more
    * hierarchically-organized file systems. Each file system has a
    * {@code root} directory from which all other files in that file system
    * can be reached. Windows platforms, for example, have a root directory
    * for each active drive; UNIX platforms have a single root directory,
    * namely {@code "/"}. The set of available filesystem roots is affected
    * by various system-level operations such as the insertion or ejection of
    * removable media and the disconnecting or unmounting of physical or
    * virtual disk drives.
    *
    * <p> This method returns an array of {@code File} objects that denote the
    * root directories of the available filesystem roots. It is guaranteed
    * that the canonical pathname of any file physically present on the local
    * machine will begin with one of the roots returned by this method.
    *
    * <p> The canonical pathname of a file that resides on some other machine
    * and is accessed via a remote-filesystem protocol such as SMB or NFS may
    * or may not begin with one of the roots returned by this method. If the
    * pathname of a remote file is syntactically indistinguishable from the
    * pathname of a local file then it will begin with one of the roots
    * returned by this method. Thus, for example, {@code File} objects
    * denoting the root directories of the mapped network drives of a Windows
    * platform will be returned by this method, while {@code File} objects
    * containing UNC pathnames will not be returned by this method.
    *
    * <p> Unlike most methods in this class, this method does not throw
    * security exceptions. If a security manager exists and its {@link
    * SecurityManager#checkRead(String)} method denies read access to a
    * particular root directory, then that directory will not appear in the
    * result.
    *
    * @return An array of {@code File} objects denoting the available
    * filesystem roots, or {@code null} if the set of roots could not
    * be determined. The array will be empty if there are no
    * filesystem roots.
    *
    * @since 1.2
    * @see java.nio.file.FileStore
    */
    public static File[] listRoots() {
    return fs.listRoots();
    }


    /* -- Disk usage -- */

    /**
    * Returns the size of the partition <a href="#partName">named</a> by this
    * abstract pathname.
    *
    * @return The size, in bytes, of the partition or <tt>0L</tt> if this
    * abstract pathname does not name a partition
    *
    * @throws SecurityException
    * If a security manager has been installed and it denies
    * {@link RuntimePermission}<tt>("getFileSystemAttributes")</tt>
    * or its {@link SecurityManager#checkRead(String)} method denies
    * read access to the file named by this abstract pathname
    *
    * @since 1.6
    */
    public long getTotalSpace() {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
    sm.checkPermission(new RuntimePermission("getFileSystemAttributes"));
    sm.checkRead(path);
    }
    return fs.getSpace(this, FileSystem.SPACE_TOTAL);
    }

    /**
    * Returns the number of unallocated bytes in the partition <a
    * href="#partName">named</a> by this abstract path name.
    *
    * <p> The returned number of unallocated bytes is a hint, but not
    * a guarantee, that it is possible to use most or any of these
    * bytes. The number of unallocated bytes is most likely to be
    * accurate immediately after this call. It is likely to be made
    * inaccurate by any external I/O operations including those made
    * on the system outside of this virtual machine. This method
    * makes no guarantee that write operations to this file system
    * will succeed.
    *
    * @return The number of unallocated bytes on the partition <tt>0L</tt>
    * if the abstract pathname does not name a partition. This
    * value will be less than or equal to the total file system size
    * returned by {@link #getTotalSpace}.
    *
    * @throws SecurityException
    * If a security manager has been installed and it denies
    * {@link RuntimePermission}<tt>("getFileSystemAttributes")</tt>
    * or its {@link SecurityManager#checkRead(String)} method denies
    * read access to the file named by this abstract pathname
    *
    * @since 1.6
    */
    public long getFreeSpace() {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
    sm.checkPermission(new RuntimePermission("getFileSystemAttributes"));
    sm.checkRead(path);
    }
    return fs.getSpace(this, FileSystem.SPACE_FREE);
    }

    /**
    * Returns the number of bytes available to this virtual machine on the
    * partition <a href="#partName">named</a> by this abstract pathname. When
    * possible, this method checks for write permissions and other operating
    * system restrictions and will therefore usually provide a more accurate
    * estimate of how much new data can actually be written than {@link
    * #getFreeSpace}.
    *
    * <p> The returned number of available bytes is a hint, but not a
    * guarantee, that it is possible to use most or any of these bytes. The
    * number of unallocated bytes is most likely to be accurate immediately
    * after this call. It is likely to be made inaccurate by any external
    * I/O operations including those made on the system outside of this
    * virtual machine. This method makes no guarantee that write operations
    * to this file system will succeed.
    *
    * @return The number of available bytes on the partition or <tt>0L</tt>
    * if the abstract pathname does not name a partition. On
    * systems where this information is not available, this method
    * will be equivalent to a call to {@link #getFreeSpace}.
    *
    * @throws SecurityException
    * If a security manager has been installed and it denies
    * {@link RuntimePermission}<tt>("getFileSystemAttributes")</tt>
    * or its {@link SecurityManager#checkRead(String)} method denies
    * read access to the file named by this abstract pathname
    *
    * @since 1.6
    */
    public long getUsableSpace() {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
    sm.checkPermission(new RuntimePermission("getFileSystemAttributes"));
    sm.checkRead(path);
    }
    return fs.getSpace(this, FileSystem.SPACE_USABLE);
    }

    /* -- Temporary files -- */

    private static class TempDirectory {
    private TempDirectory() { }

    // temporary directory location
    private static final File tmpdir = new File(fs.normalize(AccessController
    .doPrivileged(new GetPropertyAction("java.io.tmpdir"))));
    static File location() {
    return tmpdir;
    }

    // file name generation
    private static final SecureRandom random = new SecureRandom();
    static File generateFile(String prefix, String suffix, File dir) {
    long n = random.nextLong();
    if (n == Long.MIN_VALUE) {
    n = 0; // corner case
    } else {
    n = Math.abs(n);
    }
    return new File(dir, prefix + Long.toString(n) + suffix);
    }
    }

    /**
    * <p> Creates a new empty file in the specified directory, using the
    * given prefix and suffix strings to generate its name. If this method
    * returns successfully then it is guaranteed that:
    *
    * <ol>
    * <li> The file denoted by the returned abstract pathname did not exist
    * before this method was invoked, and
    * <li> Neither this method nor any of its variants will return the same
    * abstract pathname again in the current invocation of the virtual
    * machine.
    * </ol>
    *
    * This method provides only part of a temporary-file facility. To arrange
    * for a file created by this method to be deleted automatically, use the
    * <code>{@link #deleteOnExit}</code> method.
    *
    * <p> The <code>prefix</code> argument must be at least three characters
    * long. It is recommended that the prefix be a short, meaningful string
    * such as <code>"hjb"</code> or <code>"mail"</code>. The
    * <code>suffix</code> argument may be <code>null</code>, in which case the
    * suffix <code>".tmp"</code> will be used.
    *
    * <p> To create the new file, the prefix and the suffix may first be
    * adjusted to fit the limitations of the underlying platform. If the
    * prefix is too long then it will be truncated, but its first three
    * characters will always be preserved. If the suffix is too long then it
    * too will be truncated, but if it begins with a period character
    * (<code>'.'</code>) then the period and the first three characters
    * following it will always be preserved. Once these adjustments have been
    * made the name of the new file will be generated by concatenating the
    * prefix, five or more internally-generated characters, and the suffix.
    *
    * <p> If the <code>directory</code> argument is <code>null</code> then the
    * system-dependent default temporary-file directory will be used. The
    * default temporary-file directory is specified by the system property
    * <code>java.io.tmpdir</code>. On UNIX systems the default value of this
    * property is typically <code>"/tmp"</code> or <code>"/var/tmp"</code>; on
    * Microsoft Windows systems it is typically <code>"C:\\WINNT\\TEMP"</code>. A different
    * value may be given to this system property when the Java virtual machine
    * is invoked, but programmatic changes to this property are not guaranteed
    * to have any effect upon the temporary directory used by this method.
    *
    * @param prefix The prefix string to be used in generating the file's
    * name; must be at least three characters long
    *
    * @param suffix The suffix string to be used in generating the file's
    * name; may be <code>null</code>, in which case the
    * suffix <code>".tmp"</code> will be used
    *
    * @param directory The directory in which the file is to be created, or
    * <code>null</code> if the default temporary-file
    * directory is to be used
    *
    * @return An abstract pathname denoting a newly-created empty file
    *
    * @throws IllegalArgumentException
    * If the <code>prefix</code> argument contains fewer than three
    * characters
    *
    * @throws IOException If a file could not be created
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method does not allow a file to be created
    *
    * @since 1.2
    */
    public static File createTempFile(String prefix, String suffix,
    File directory)
    throws IOException
    {
    if (prefix.length() < 3)
    throw new IllegalArgumentException("Prefix string too short");
    if (suffix == null)
    suffix = ".tmp";

    File tmpdir = (directory != null) ? directory : TempDirectory.location();
    SecurityManager sm = System.getSecurityManager();
    File f;
    do {
    f = TempDirectory.generateFile(prefix, suffix, tmpdir);
    if (sm != null) {
    try {
    sm.checkWrite(f.getPath());
    } catch (SecurityException se) {
    // don't reveal temporary directory location
    if (directory == null)
    throw new SecurityException("Unable to create temporary file");
    throw se;
    }
    }
    } while (!fs.createFileExclusively(f.getPath()));
    return f;
    }

    /**
    * Creates an empty file in the default temporary-file directory, using
    * the given prefix and suffix to generate its name. Invoking this method
    * is equivalent to invoking <code>{@link #createTempFile(java.lang.String,
    * java.lang.String, java.io.File)
    * createTempFile(prefix,&nbsp;suffix,&nbsp;null)}</code>.
    *
    * <p> The {@link
    * java.nio.file.Files#createTempFile(String,String,j ava.nio.file.attribute.FileAttribute[])
    * Files.createTempFile} method provides an alternative method to create an
    * empty file in the temporary-file directory. Files created by that method
    * may have more restrictive access permissions to files created by this
    * method and so may be more suited to security-sensitive applications.
    *
    * @param prefix The prefix string to be used in generating the file's
    * name; must be at least three characters long
    *
    * @param suffix The suffix string to be used in generating the file's
    * name; may be <code>null</code>, in which case the
    * suffix <code>".tmp"</code> will be used
    *
    * @return An abstract pathname denoting a newly-created empty file
    *
    * @throws IllegalArgumentException
    * If the <code>prefix</code> argument contains fewer than three
    * characters
    *
    * @throws IOException If a file could not be created
    *
    * @throws SecurityException
    * If a security manager exists and its <code>{@link
    * java.lang.SecurityManager#checkWrite(java.lang.Str ing)}</code>
    * method does not allow a file to be created
    *
    * @since 1.2
    * @see java.nio.file.Files#createTempDirectory(String,Fil eAttribute[])
    */
    public static File createTempFile(String prefix, String suffix)
    throws IOException
    {
    return createTempFile(prefix, suffix, null);
    }

    /* -- Basic infrastructure -- */

    /**
    * Compares two abstract pathnames lexicographically. The ordering
    * defined by this method depends upon the underlying system. On UNIX
    * systems, alphabetic case is significant in comparing pathnames; on Microsoft Windows
    * systems it is not.
    *
    * @param pathname The abstract pathname to be compared to this abstract
    * pathname
    *
    * @return Zero if the argument is equal to this abstract pathname, a
    * value less than zero if this abstract pathname is
    * lexicographically less than the argument, or a value greater
    * than zero if this abstract pathname is lexicographically
    * greater than the argument
    *
    * @since 1.2
    */
    public int compareTo(File pathname) {
    return fs.compare(this, pathname);
    }

    /**
    * Tests this abstract pathname for equality with the given object.
    * Returns <code>true</code> if and only if the argument is not
    * <code>null</code> and is an abstract pathname that denotes the same file
    * or directory as this abstract pathname. Whether or not two abstract
    * pathnames are equal depends upon the underlying system. On UNIX
    * systems, alphabetic case is significant in comparing pathnames; on Microsoft Windows
    * systems it is not.
    *
    * @param obj The object to be compared with this abstract pathname
    *
    * @return <code>true</code> if and only if the objects are the same;
    * <code>false</code> otherwise
    */
    public boolean equals(Object obj) {
    if ((obj != null) && (obj instanceof File)) {
    return compareTo((File)obj) == 0;
    }
    return false;
    }

    /**
    * Computes a hash code for this abstract pathname. Because equality of
    * abstract pathnames is inherently system-dependent, so is the computation
    * of their hash codes. On UNIX systems, the hash code of an abstract
    * pathname is equal to the exclusive <em>or</em> of the hash code
    * of its pathname string and the decimal value
    * <code>1234321</code>. On Microsoft Windows systems, the hash
    * code is equal to the exclusive <em>or</em> of the hash code of
    * its pathname string converted to lower case and the decimal
    * value <code>1234321</code>. Locale is not taken into account on
    * lowercasing the pathname string.
    *
    * @return A hash code for this abstract pathname
    */
    public int hashCode() {
    return fs.hashCode(this);
    }

    /**
    * Returns the pathname string of this abstract pathname. This is just the
    * string returned by the <code>{@link #getPath}</code> method.
    *
    * @return The string form of this abstract pathname
    */
    public String toString() {
    return getPath();
    }

    /**
    * WriteObject is called to save this filename.
    * The separator character is saved also so it can be replaced
    * in case the path is reconstituted on a different host type.
    * <p>
    * @serialData Default fields followed by separator character.
    */
    private synchronized void writeObject(java.io.ObjectOutputStream s)
    throws IOException
    {
    s.defaultWriteObject();
    s.writeChar(this.separatorChar); // Add the separator character
    }

    /**
    * readObject is called to restore this filename.
    * The original separator character is read. If it is different
    * than the separator character on this system, then the old separator
    * is replaced by the local separator.
    */
    private synchronized void readObject(java.io.ObjectInputStream s)
    throws IOException, ClassNotFoundException
    {
    ObjectInputStream.GetField fields = s.readFields();
    String pathField = (String)fields.get("path", null);
    char sep = s.readChar(); // read the previous separator char
    if (sep != separatorChar)
    pathField = pathField.replace(sep, separatorChar);
    this.path = fs.normalize(pathField);
    this.prefixLength = fs.prefixLength(this.path);
    }

    /** use serialVersionUID from JDK 1.0.2 for interoperability */
    private static final long serialVersionUID = 301077366599181567L;

    // -- Integration with java.nio.file --

    private volatile transient Path filePath;

    /**
    * Returns a {@link Path java.nio.file.Path} object constructed from the
    * this abstract path. The resulting {@code Path} is associated with the
    * {@link java.nio.file.FileSystems#getDefault default-filesystem}.
    *
    * <p> The first invocation of this method works as if invoking it were
    * equivalent to evaluating the expression:
    * <blockquote><pre>
    * {@link java.nio.file.FileSystems#getDefault FileSystems.getDefault}().{@link
    * java.nio.file.FileSystem#getPath getPath}(this.{@link #getPath getPath}());
    * </pre></blockquote>
    * Subsequent invocations of this method return the same {@code Path}.
    *
    * <p> If this abstract pathname is the empty abstract pathname then this
    * method returns a {@code Path} that may be used to access the current
    * user directory.
    *
    * @return a {@code Path} constructed from this abstract path
    *
    * @throws java.nio.file.InvalidPathException
    * if a {@code Path} object cannot be constructed from the abstract
    * path (see {@link java.nio.file.FileSystem#getPath FileSystem.getPath})
    *
    * @since 1.7
    * @see Path#toFile
    */
    public Path toPath() {
    Path result = filePath;
    if (result == null) {
    synchronized (this) {
    result = filePath;
    if (result == null) {
    result = FileSystems.getDefault().getPath(path);
    filePath = result;
    }
    }
    }
    return result;
    }
    }


    /code


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    Default Re: i/o error when using Netbeans 7.3 and Java 7

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