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Thread: Strange errors with java.nio.file

  1. #1
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    Default Strange errors with java.nio.file

    Hello, I am learning some basic file operations in Java and running into a strange error. Code in my Java textbook is shown below:

    PHP Code:
    import java.nio.file.*;

    public class 
    PathDemo
    {
       public static 
    void main(String[] args)
       {
          
    Path filePath =
             
    Paths.get("c:\\Java\\Chapter.13\\Data.txt");
          
    int count filePath.getNameCount();
          
    System.out.println("Path is " filePath.toString());
          
    System.out.println("File name is " filePath.getName());
          
    System.out.println("There are " count +
             
    " elements in the file path");
          for(
    int x 0count; ++x)
            
    System.out.println("Element " " is " +
            
    filePath.getName(x));
       }

    I am using jGRASP (Java SDK 1.7 installed) and when I try to compile I am getting an error

    PHP Code:
    PathDemo.java:11errormethod getName in interface Path cannot be applied to given types;
          
    System.out.println("File name is " filePath.getName());
                                                                   ^
      
    requiredint
      found
    no arguments
      reason
    actual and formal argument lists differ in length
    1 error 
    I am really at loss on what I am doing wrong. Any help would be appreciated.


  2. #2
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    Default Re: Strange errors with java.nio.file

    By looking at the error description, getName() takes integer arguments and it can not find any argument. It's implemented with taking an integer argument.

  3. #3
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    Default Re: Strange errors with java.nio.file

    Thank you so much! Giving it a integer parameter does work

    PHP Code:
    System.out.println("File name is " filePath.getName(0)); 

    another errors that might be related to nio class

    PHP Code:
    import java.nio.file.*;
    import static java.nio.file.AccessMode.*;
    import java.io.IOException;
    public class 
    PathDemo3
    {
       public static 
    void main(String[] args)
       {
          
    Path filePath =
             
    Paths.get("C:\\Java\\Chapter.13\\Data.txt");
          
    System.out.println("Path is " filePath.toString());
          try
          {
             
    filePath.checkAccess(READEXECUTE);
             
    System.out.println("File can be read and executed");
          }
          catch(
    IOException e)
          {
             
    System.out.println("File cannot be used for this application");
          }
       }

    and

    PHP Code:
    import java.nio.file.*;
    import java.io.IOException;
    public class 
    PathDemo4
    {
       public static 
    void main(String[] args)
       {
          
    Path filePath =
             
    Paths.get("C:\\Java\\Chapter.13\\Data.txt");
          try
          {
              
    filePath.delete();
              
    System.out.println("File or directory is deleted");
          }
          catch (
    NoSuchFileException e)
          {
             
    System.out.println("No such file or directory");
          }
          catch (
    DirectoryNotEmptyException e)
          {
             
    System.out.println("Directory is not empty");
          }
          catch (
    IOException e
          {
             
    System.out.println("No permission to delete");
          }
       }

    return

    PHP Code:
    PathDemo3.java:13errorcannot find symbol
             filePath
    .checkAccess(READEXECUTE);
                     ^
      
    symbol:   method checkAccess(AccessMode,AccessMode)
      
    locationvariable filePath of type Path
    1 error 
    and


    PHP Code:
    PathDemo4.java:11errorcannot find symbol
              filePath
    .delete();
                      ^
      
    symbol:   method delete()
      
    locationvariable filePath of type Path
    1 error

     
    ----jGRASP wedge2: exit code for process is 1.
     
    ----jGRASPoperation complete
    it sure looks like I am missing an include, but the only thing that is confusing that those two programs are in my "Java Programming by Joyce Farrell. 6th edition" textbook and according to author should compile without an error.

  4. #4
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    Default Re: Strange errors with java.nio.file

    I'm having that same issue using the same book, how did you manage to get past it?

  5. #5
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    Default Re: Strange errors with java.nio.file

    Quote Originally Posted by Phynx View Post
    I'm having that same issue using the same book, how did you manage to get past it?
    Did you include Path file in your project?

  6. #6
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    Default Re: Strange errors with java.nio.file

    Nope, since i wrote the code exactly as its shown in the book, i'll include path and see if it goes through

  7. #7
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    Default Re: Strange errors with java.nio.file

    well didn't make a difference, i imported the following..

    import java.nio.file.*;
    import java.nio.file.Path;
    import java.nio.file.Paths;
    import java.nio.file.Files;
    import java.nio.file.AccessMode;
    import static java.nio.file.AccessMode.*;
    import java.nio.file.spi.FileSystemProvider;
    import java.io.IOException;
    import java.io.File;


    still receive this error.

    PathDemo3.java:19: error: cannot find symbol
    filePath.checkAccess(READ,EXECUTE); 
            ^
      symbol:   method checkAccess(AccessMode,AccessMode)
      location: variable filePath of type Path
    1 error
    Last edited by Phynx; January 4th, 2012 at 12:09 PM.

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    Default Re: Strange errors with java.nio.file

    Can't see a checkAccess method anywhere in the API for nio Path.
    Last edited by newbie; January 4th, 2012 at 12:59 PM.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  9. #9
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    Default Re: Strange errors with java.nio.file

    java.nio.file.spi.FileSystemProvider has an checkAccess method
    FileSystemProvider (Java Platform SE 7 )

    which is why i imported it, but it didn't make a difference, so it may be a mistake written in the book which is a shame since this book doesn't have much for the older java.io package.

  10. #10
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    Default Re: Strange errors with java.nio.file

    But you have a Path object, which doesn't seem to extend the abstract class FileSystemProvider, so the method will be unavaliable to a Path object.
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

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