I have problem when I want connect keyevent with text fields

[Wishes]

hey every body,

its first time to me work with swing

I am trying to build frame with text field and text area and two button (start and stop)

in textfield the user enter the file name with its path and he must press enter

when he press enter I must open the file if its exist and store it in array list

if the user press start button the text will be auto scrolling if he press stop button the scrolling

I build the frame but my first step its get the file name but I am struggling with keyevent

this is my codes until now could any one please tell what is the mistake I did

// main

import javax.swing.*;
/**
 *
 * @author Bobi
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
       new GUI();



    }

}

// my interface

import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
/**
 *
 * @author Bobi
 */
public class GUI extends javax.swing.JFrame  {
     private JButton start;
    private JButton stop;
    private JButton enter;
    private JLabel label;
    private javax.swing.JScrollPane jScrollPane1;
    private JTextArea text;
    private JTextField filename;
    private JFrame frame;
    private ArrayList <String> inputtext = new ArrayList <String> ();
    private Font font=new Font("JSL Ancient",Font.BOLD,14);
   
    public GUI(){makeframe();}

    private void makeframe(){

        frame =new JFrame("CourseWork 2 ");
        frame.setSize(800,800);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        Container contentPane = frame.getContentPane();
        start= new JButton ("Start");
        start.setSize(150,150);
        start.setFont(font);
        stop = new JButton ("Stop");
        stop.setSize(150,150);
        text= new JTextArea(40,68);
        text.setLineWrap(true);
        text.setLineWrap(true);
        filename=new JTextField(68);
        filename.setEditable(true);
         filename.setFocusable(true);
         //*** to get the file name after press enter
     //   filename.addKeyListener(new keyenter());
        label =new JLabel ("Please eneter the file name with full path");
        label.setSize(200,100);
        label.setBackground(Color.MAGENTA);
        contentPane.setLayout(new FlowLayout());
         contentPane.add(label);
        contentPane.add(filename);
   
      //  enter.addActionListener(enteraction);
         contentPane.add(text);
        contentPane.add(start);
       contentPane.add(stop);
       
        
       
        frame.setVisible(true);
        /*frame =new JFrame("HEEEEEE");
        frame.setVisible(true);*/
      /*  contentPane.setLayout(new BorderLayout());
        contentPane.add(label,BorderLayout.NORTH);
        contentPane.add(filename,BorderLayout.AFTER_LINE_ENDS);
        contentPane.add(text,BorderLayout.CENTER);
        contentPane.add(start,BorderLayout.SOUTH);
        contentPane.add(stop,BorderLayout.AFTER_LINE_ENDS);*/


        /****************************get file name
         * ************************/

        /*********************
         * implment the action listener of enter key
         */
  //  private class keyenter1 implements KeyListener {
  //  }

//class key

    }

}

package javaapplication7;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
/**
 *
 * @author Bobi
 */
 public class  keyenter extends JFrame implements KeyListener  {

     public keyenter ()//constructor
     {}
          public  ArrayList <String> KeyPressed (KeyEvent e){
          if(e.getKeyChar() == e.VK_ENTER) {
// if is the user press enetr we take the file path with its name to open


}// end if
          // i want here to take the file name after the user press enter
          String name = filename.getText();
          // we use buffer reader becuase we need to read the file line by line
        try{
          FileReader fin = new FileReader(name);
          BufferedReader INPUTFILE = new BufferedReader(fin);
          //creat arraylist to store all text lines
          ArrayList <String> lines = new ArrayList <String>();

         while (( INPUTFILE.readLine()) != null) {
              String Line= INPUTFILE.readLine();
             lines.add(Line);
}
INPUTFILE.close();

          return lines;
              }
         catch (Exception f){
	  //Catch exception if any error occure
      System.err.println("Error: " + f.getMessage());
    }

    }
}

I am using netbeans now but i didnt use any ready frame or design because I must know how I build the event by my self

THANK YOU
wishes:)

[Fubarable]

Your code won't compile, and when that happens you need to post the compile error statement and let us know which line(s) cause the error.

[Fubarable]

Also, you don't need to or want to use a key listener to capture pressing enter in a JTextField. Instead add an ActionListener to the JTextField and its actionPerformed method will be called whenever the JTextField has focus and enter has been pressed. If you do this, you will find that the actionPerformed's parameter, ActionEvent has a getSource() method which will return the JTextField that is listening for the event to occur -- it will return your JTextField. You will need to case it to JTextField but you can use it to get the field's text.

[Wishes]

Hey I did compile my code and it show me the interface with all fields I design but with out adding any key listener



when I add key listener like what I did is give this error
run:
Exception in thread "main" java.lang.ExceptionInInitializerError
at javaapplication7.GUI.makeframe(GUI.java:49)
at javaapplication7.GUI.<init>(GUI.java:26)
at javaapplication7.Main.main(Main.java:19)
Caused by: java.lang.RuntimeException: Uncompilable source code - javaapplication7.keyenter is not abstract and does not override abstract method keyReleased(java.awt.event.KeyEvent) in java.awt.event.KeyListener
at javaapplication7.keyenter.<clinit>(keyenter.java:1 6)
... 3 more
Java Result: 1

because that am sure my way with key listener is wrong but I don't know what is wrong

[Fubarable]

Again, don't use a KeyListener for this. Again, add an ActionListener to the JTextField.

As for that error, whenever a class implements an interface, the class must implement all of the interfaces classes. If and when you need to use the KeyListener interface, the Java API will tell you exactly what those methods are. For an ActionListener though, there's only one method that your class will need to implement -- actionPerformed(ActionEvent e)

[Wishes]

thank you again
and I will search on google about your suggestion
I didn't I could use action listener with enter

wishes :)

[Wishes]

hey

thank I did it I road the file and I did print on screen as test it work

but I have two questions please

first :/can I put more than actionperformd because I have 3 components
or I use get sources each time in one action performance

second : can I write what I want in ACTION PERFORMANCE for example if want luanch a thread in each objects .

thank you very much.

[Fubarable]

Please try that again because I'm just not getting what you're asking.

[Wishes]

thank you my question if I do something like following code is acceptable or wrong .

public void actionPerformed(ActionEvent evt) {


   if (evt.getSource() ==filename)

   { //if the source is textfiel
    String name = filename.getText();
    try{ 
          FileReader fin = new FileReader(name);
          BufferedReader INPUTFILE = new BufferedReader(fin);
            // read the file line by line and store it in array list
         while (( INPUTFILE.readLine()) != null) {
              String Line= INPUTFILE.readLine();
             inputtext.add(Line);
        }
                   INPUTFILE.close();
// just for test i must remove it **
         int size=inputtext.size();
         for (int i=0;i<size;i++)
         {    System.out.println(inputtext.get(i));   }
          }//end try
         catch (Exception f){
	  //Catch exception if any error occure
          System.err.println("Error: " + f.getMessage());
                           }//end cathch
    }//end true if
                   else if (evt.getSource()==start)
   {// startthread here whic append line line to text area 
// iS IT  O.k if I Started THREAD HERE?
   }
   else {//the source is stop button  }
       //I must stop append the text (using thread
}
    
    }
}

thank you