Capturing all type of inputs in a JTextField

[John Fernandas]

Hi i used 4 JTextField in my swing form.i need to do is moving the focus from one JTextField to the other JTextField by hit the enter key and tab key.i done it successfully but the problem was the JTextField allows only numeric values if i give any value other than numeric value in the JTextfield the JTextField is locked and there is no focus transfer happen between the JTextFields.the code i was used

        package focus;
        import java.awt.Component;
        import java.awt.FlowLayout;
        import java.awt.event.FocusAdapter;
        import java.awt.event.FocusEvent;
        import java.awt.event.KeyAdapter.*;
        import java.awt.event.KeyEvent;
        import java.awt.event.KeyListener;
        import javax.swing.JFrame;
        import javax.swing.JTextField;
        import javax.swing.text.JTextComponent;
        
        public class Main implements KeyListener{
            JTextField txt1 = new JTextField(20);
            JTextField txt2 = new JTextField(20);
            JTextField txt3 = new JTextField(20);
            JTextField txt4 = new JTextField(20);
            JFrame f = new JFrame();
            public Main()
            {
        
             txt1.addFocusListener(new MyFocusListener<JTextField>());
            txt2.addFocusListener(new MyFocusListener<JTextField>());
            txt3.addFocusListener(new MyFocusListener<JTextField>());
            txt4.addFocusListener(new MyFocusListener<JTextField>());
             txt1.addKeyListener(this);
              txt2.addKeyListener(this);
               txt3.addKeyListener(this);
             txt4.addKeyListener(this);
            f.setLayout(new FlowLayout());
            f.add(txt1);
            f.add(txt2);
             f.add(txt3);
              f.add(txt4);
            f.pack();
            f.setVisible(true);}
        
          public static void main(String[] argv) throws Exception {
              new Main();
            
          }
        
            public void keyTyped(KeyEvent e) {
                
            }
        
            public void keyPressed(KeyEvent ke) {
                        if (ke.getSource() == txt1)
          {
            if (ke.getKeyCode() == KeyEvent.VK_ENTER)
            {
              txt2.requestFocusInWindow();
              txt2.selectAll();
            }
          }
          else if (ke.getSource() == txt2)
        
          {
            if (ke.getKeyCode() == KeyEvent.VK_ENTER)
            {
              txt3.requestFocusInWindow();
              txt3.selectAll();
            }
          }
          else if (ke.getSource() == txt3)
          {
            if (ke.getKeyCode() == KeyEvent.VK_ENTER)
            {
              txt4.requestFocusInWindow();
              txt4.selectAll();
                  }
          }
        else if (ke.getSource() == txt4)
          {
            if (ke.getKeyCode() == KeyEvent.VK_ENTER)
            {
              txt1.requestFocusInWindow();
              txt1.selectAll();
                  }
          }
        
            }
        
            public void keyReleased(KeyEvent e) {
                
            }
        }
        class MyFocusListener <C extends JTextField> extends  FocusAdapter {
          //boolean showingDialog = false;
          public void focusGained(FocusEvent evt) {
            final JTextComponent c = (JTextComponent) evt.getSource();
            String s = c.getText();
            c.requestFocus();
            c.selectAll();
            for (int i = 0; i < s.length(); i++) {
           if (!Character.isDigit(s.charAt(i))) {
           c.setSelectionStart(i);
            c.setSelectionEnd(i);
               break;
           }
            }
          }
        
          public void focusLost(FocusEvent evt) {
            final JTextComponent c = (JTextComponent) evt.getSource();
            String s = c.getText();
            
           if (evt.isTemporary()) {
             return;
            }
            for (int i = 0; i < s.length(); i++) {
           if (!Character.isDigit(s.charAt(i))) {
               //System.out.println("must only contain digits");
                c.requestFocus();
                c.selectAll();
                break;
              }
          }
            }
        
        }

[Darryl Burke]

First off, see the API for the requestFocus() method and follow the advice given there about which method you should use instead.

the problem was the JTextField allows only numeric values if i give any value other than numeric value in the JTextfield the JTextField is locked and there is no focus transfer happen between the JTextFields.the code i was used

If you didn't want that behavior, then why did you code for it? Where did you get this line?

if (!Character.isDigit(s.charAt(i))) {  

Trying to create a program with just two keystrokes** doesn't work. You have to buckle down and learn to understand the code you're using. And the only way to get there is to first write your own code.

Oh, and please BeForthrightWhenCrossPostingToOtherSites
http://stackoverflow.com/questions/8586013/transfer-the-focus-among-the-jtextfields-in-java-swing
http://forums.oreilly.com/topic/71434-generic-class-in-java/
http://www.dreamincode.net/forums/topic/260520-writing-generic-class-with-parameter-in-java/

This also appears to be a continuation of your earlier question, and should have been posted in the same thread.
http://www.coderanch.com/t/561993/GUI/java/Focus-Gained-event
Also, you should have the courtesy to replay to responses on any thread you start.


** Ctrl+C, Crtl+V