Thread: A headache!

Okay as of now I am working on my string builder in my program. If you've read my other posts I have been working away on a copy method.


textField and textField1 are the selected files from my copy method, the source is textField and the target is textField1.

I need it to be
c:\\blahblah\\blahblah\\blah\\
since
c:\blahblah\blah\blah\
wont work.

I've been searching through the stringBuilder.insert commands and I am a bit confused, how would I go about doing what I am wanting to do?

        public void copyMethod() {
   //         JOptionPane.showMessageDialog(null, "Copying has commenced, watch the magic happen!");
 
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.insert(int );
 
 
            FileInputStream from = null;
            FileOutputStream to  = null;
 
//Size of buffer (too much will crash)
            int buffSize = 4000; 
//Start 
 
 
            try {    
 
 
            from = new FileInputStream(textField.toString());         //Stream from file 
 
 
            to   = new FileOutputStream(textField1.toString());      //Stream to copy file
            byte[] charBuffer = new byte[buffSize];
 
            int numRead;    //to keep track of where you are in the file
           //Loop through the file taking in buffSize bytes and copying them to textField1
            while((numRead = from.read(charBuffer)) != -1 )     // -1 so no out of bounds
            to.write(charBuffer, 0, numRead);      //This will copy code
} 
 
            catch(Exception Ex){
 
                Ex.printStackTrace();
 
        }
 
        }}

Here is my whole program while starting the stringBuilder.

package synch;
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
 
public class Synch extends JPanel {
 
 
    private JButton setSource = new JButton("Set Source");
    private JButton setTarget = new JButton("Set Target");
    private JButton copyButton = new JButton("Copy!");
    private JTextField textField = new JTextField(" ");
    private JTextField textField1 = new JTextField(" ");
    private JFileChooser fc = new JFileChooser();
 
    private JMenuItem Exit, oneWaySynch, twoWaySynch, Help, About, HelpMe;
 
 
    public Synch(){
        JFrame prog = new JFrame("Chris's file synchronization");
        prog.setSize(500,500);
        prog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        JMenuBar jmb = new JMenuBar();
        prog.setJMenuBar(jmb);
        JMenu fileMenu = new JMenu("File");
        jmb.add(fileMenu);
        fileMenu.add(oneWaySynch = new JMenuItem(" One way Synch "));
        fileMenu.add(twoWaySynch = new JMenuItem(" Two way Synch "));
        fileMenu.add(Exit = new JMenuItem("Exit"));
 
        JMenu helpMenu = new JMenu("Help");
        jmb.add(helpMenu);
        helpMenu.add(HelpMe = new JMenuItem("Help"));
        helpMenu.add(About = new JMenuItem("About"));      
 
 
        prog.setLayout(new BorderLayout());    
 
        JPanel outterPanel = new JPanel();              
        outterPanel.setLayout(new GridLayout(2,1));
 
        //Set up the top panel of the outer panel
        JPanel topPannel = new JPanel();      
        topPannel.add(textField);
        textField.setPreferredSize(new Dimension(300,30));
        topPannel.add(setSource);
 
        //Set up the bottom panel of the outer panel
        JPanel bottomPanel = new JPanel(); 
        bottomPanel.add(textField1);
        textField1.setPreferredSize(new Dimension(300,30));
        bottomPanel.add(setTarget);
 
        //Add the top and bottom panels to the outer panel
        outterPanel.add(topPannel);
        outterPanel.add(bottomPanel);
 
        prog.add(outterPanel, BorderLayout.NORTH);
 
        JPanel Pane3 = new JPanel();
        fc.setControlButtonsAreShown(false);
        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        Pane3.add(fc, FlowLayout.LEFT);              
        prog.add(Pane3, BorderLayout.CENTER);
 
 
 
        JPanel Pane4 = new JPanel();
        Pane4.add(copyButton, FlowLayout.LEFT);
        prog.add(Pane4, BorderLayout.SOUTH);
 
 
        Exit.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               exitMethod();
           }
        });
 
         oneWaySynch.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               oneWayMethod();
           }
        });     
 
        twoWaySynch.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               twoWayMethod();
           }
        });
 
         HelpMe.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               helpMethod();
            }
            });
 
         About.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               aboutMethod();           
            }
            });         
 
         setSource.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               setSourceMethod();           
            }
            });
 
         setTarget.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               setTargetMethod();           
            }
            });
 
 
         copyButton.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               copyMethod();           
            }
            });  
 
        prog.setVisible(true); //Display the window to the user!      
 
    } //end of method Synch()
 
        public void exitMethod() {
            if(JOptionPane.showConfirmDialog(null,"Are you sure you want it to close?", "Confirm Exit", JOptionPane.YES_NO_OPTION)==JOptionPane.YES_OPTION)
                System.exit(0);  
        }
 
 
        public void oneWayMethod() {
            //Read the next file in the source directory
 
            //See if it exists in the target directory
 
            //  if it does, check to see if it is EXACTLY the same file
 
            //  if not copy the file
            JOptionPane.showMessageDialog(null, "One way sync has been activated.");
 
 
        }
        public void twoWayMethod() {
            JOptionPane.showMessageDialog(null, "Two way sync has been activated.");
 
        }
 
        public void aboutMethod() {
            JOptionPane.showMessageDialog(null, "This is a file synchronization program, to speed things up, and over all make it easier for you.");
               }
 
        public void helpMethod() {
            JOptionPane.showMessageDialog(null, "If you are needing assistance please contact me via email: egamespaypal@gmail.com or by phone 1-901-619-9413.");
 
 
        }
 
        public void setSourceMethod() {
            //read the directory that the file chooser is currently sitting on
             textField.setText(fc.getSelectedFile().toString());
            JOptionPane.showMessageDialog(null, "The source has been locked in!");
 
 
        }
 
 
        public void setTargetMethod() {
            //read the directory that the file chooser is currently sitting on
            textField1.setText(fc.getSelectedFile().toString());
 
            JOptionPane.showMessageDialog(null, "The target location has been locked in!");
 
 
        }
 
        public void copyMethod() {
   //         JOptionPane.showMessageDialog(null, "Copying has commenced, watch the magic happen!");
 
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.insert(int );
 
 
            FileInputStream from = null;
            FileOutputStream to  = null;
 
//Size of buffer (too much will crash)
            int buffSize = 4000; 
//Start 
 
 
            try {    
 
 
            from = new FileInputStream(textField.toString());         //Stream from file 
 
 
            to   = new FileOutputStream(textField1.toString());      //Stream to copy file
            byte[] charBuffer = new byte[buffSize];
 
            int numRead;    //to keep track of where you are in the file
           //Loop through the file taking in buffSize bytes and copying them to textField1
            while((numRead = from.read(charBuffer)) != -1 )     // -1 so no out of bounds
            to.write(charBuffer, 0, numRead);      //This will copy code
} 
 
            catch(Exception Ex){
 
                Ex.printStackTrace();
 
        }
 
        }}

Okay, let me see if I can break it down a little bit.

The main problem is within my copyMethod. Everything else is working peachy! In my copyMethod textField/textField1 is the source/destination after the files are selected using the file chooser.

I am wanting the source which is textField(source) to be copied to textField1(destination) which is the destination.

Is that good? I am a novice when it comes to Java, still learning step by step! Thank you very much for your time.

When I run the program the program has no errors and runs fine. As of now I believe the Copy method will error since I have,

StringBuilder stringBuilder = new StringBuilder();
stringBuilder.insert(int );

In my copy method. This can be removed, it was me working on it and not commenting it out, my apologies!

When the program runs, I select the directory in the file chooser as my source, then I set target.

I am wanting to copy one directory to another, so this is the problem I am facing. My current copy method does not let me do this since I think as of now it'll only copy the text that is sent to textField(source)/textField1(destination) not the files that are chosen.

What I think I need to do is a string builder the way I was doing? I am confused.

When I run the program the program has no errors and runs fine.

Have you changed the code since you posted it? The posted version DOES NOT RUN!!!

I made changes to it and am able to get it to run IF AND ONLY IF I press the buttons in the correct order. Push them in the wrong order and the program throws a NPE.
The code should disable buttons that should not be pushed until the data is there.

I am wanting to copy one directory to another

You need to get a list of the files in a directory to be able to copy the contents of one directory to another. See the File class for methods to get a list of files.

Why do you want to use StringBuilder? It has no use in your application.

Yes, here is the code with no errors.

package synch;
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
 
public class Synch extends JPanel {
 
 
    private JButton setSource = new JButton("Set Source");
    private JButton setTarget = new JButton("Set Target");
    private JButton copyButton = new JButton("Copy!");
    private JTextField textField = new JTextField(" ");
    private JTextField textField1 = new JTextField(" ");
    private JFileChooser fc = new JFileChooser();
 
    private JMenuItem Exit, oneWaySynch, twoWaySynch, Help, About, HelpMe;
 
 
    public Synch(){
        JFrame prog = new JFrame("Chris's file synchronization");
        prog.setSize(500,500);
        prog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        JMenuBar jmb = new JMenuBar();
        prog.setJMenuBar(jmb);
        JMenu fileMenu = new JMenu("File");
        jmb.add(fileMenu);
        fileMenu.add(oneWaySynch = new JMenuItem(" One way Synch "));
        fileMenu.add(twoWaySynch = new JMenuItem(" Two way Synch "));
        fileMenu.add(Exit = new JMenuItem("Exit"));
 
        JMenu helpMenu = new JMenu("Help");
        jmb.add(helpMenu);
        helpMenu.add(HelpMe = new JMenuItem("Help"));
        helpMenu.add(About = new JMenuItem("About"));      
 
 
        prog.setLayout(new BorderLayout());    
 
        JPanel outterPanel = new JPanel();              
        outterPanel.setLayout(new GridLayout(2,1));
 
        //Set up the top panel of the outer panel
        JPanel topPannel = new JPanel();      
        topPannel.add(textField);
        textField.setPreferredSize(new Dimension(300,30));
        topPannel.add(setSource);
 
        //Set up the bottom panel of the outer panel
        JPanel bottomPanel = new JPanel(); 
        bottomPanel.add(textField1);
        textField1.setPreferredSize(new Dimension(300,30));
        bottomPanel.add(setTarget);
 
        //Add the top and bottom panels to the outer panel
        outterPanel.add(topPannel);
        outterPanel.add(bottomPanel);
 
        prog.add(outterPanel, BorderLayout.NORTH);
 
        JPanel Pane3 = new JPanel();
        fc.setControlButtonsAreShown(false);
        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        Pane3.add(fc, FlowLayout.LEFT);              
        prog.add(Pane3, BorderLayout.CENTER);
 
 
 
        JPanel Pane4 = new JPanel();
        Pane4.add(copyButton, FlowLayout.LEFT);
        prog.add(Pane4, BorderLayout.SOUTH);
 
 
        Exit.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               exitMethod();
           }
        });
 
         oneWaySynch.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               oneWayMethod();
           }
        });     
 
        twoWaySynch.addActionListener(new ActionListener(){
           public void actionPerformed (ActionEvent e){
               twoWayMethod();
           }
        });
 
         HelpMe.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               helpMethod();
            }
            });
 
         About.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               aboutMethod();           
            }
            });         
 
         setSource.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               setSourceMethod();           
            }
            });
 
         setTarget.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               setTargetMethod();           
            }
            });
 
 
         copyButton.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){
               copyMethod();           
            }
            });  
 
        prog.setVisible(true); //Display the window to the user!      
 
    } //end of method Synch()
 
        public void exitMethod() {
            if(JOptionPane.showConfirmDialog(null,"Are you sure you want it to close?", "Confirm Exit", JOptionPane.YES_NO_OPTION)==JOptionPane.YES_OPTION)
                System.exit(0);  
        }
 
 
        public void oneWayMethod() {
            //Read the next file in the source directory
 
            //See if it exists in the target directory
 
            //  if it does, check to see if it is EXACTLY the same file
 
            //  if not copy the file
            JOptionPane.showMessageDialog(null, "One way sync has been activated.");
 
 
        }
        public void twoWayMethod() {
            JOptionPane.showMessageDialog(null, "Two way sync has been activated.");
 
        }
 
        public void aboutMethod() {
            JOptionPane.showMessageDialog(null, "This is a file synchronization program, to speed things up, and over all make it easier for you.");
               }
 
        public void helpMethod() {
            JOptionPane.showMessageDialog(null, "If you are needing assistance please contact me via email: egamespaypal@gmail.com or by phone 1-901-619-9413.");
 
 
        }
 
        public void setSourceMethod() {
            //read the directory that the file chooser is currently sitting on
             textField.setText(fc.getSelectedFile().toString());
            JOptionPane.showMessageDialog(null, "The source has been locked in!");
 
 
        }
 
 
        public void setTargetMethod() {
            //read the directory that the file chooser is currently sitting on
            textField1.setText(fc.getSelectedFile().toString());
 
            JOptionPane.showMessageDialog(null, "The target location has been locked in!");
 
 
        }
 
        public void copyMethod() {
   //         JOptionPane.showMessageDialog(null, "Copying has commenced, watch the magic happen!");
 
 
            FileInputStream from = null;
            FileOutputStream to  = null;
 
//Size of buffer (too much will crash)
            int buffSize = 4000; 
//Start 
 
 
            try {    
 
 
            from = new FileInputStream(textField.toString());         //Stream from file 
 
 
            to   = new FileOutputStream(textField1.toString());      //Stream to copy file
            byte[] charBuffer = new byte[buffSize];
 
            int numRead;    //to keep track of where you are in the file
           //Loop through the file taking in buffSize bytes and copying them to textField1
            while((numRead = from.read(charBuffer)) != -1 )     // -1 so no out of bounds
            to.write(charBuffer, 0, numRead);      //This will copy code
} 
 
            catch(Exception Ex){
 
                Ex.printStackTrace();
 
        }
 
        }}

I dont see how you're getting an error only if I am doing something wrong?

I select the directory in the file chooser, I select "Set source" for the source of what I am wanting to copy.

I select another directory i nthe file chooser, I select "Set target" for the destination of where I am wanting to copy the directory too.

I click copy, but my copy method does not copy. That is where I thought the string builder is the problem? But it isn't? When I press copy, nothing happens that I know of.