Demonstrating the FocusListener

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class FocusTest {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    Container contentPane = frame.getContentPane();

    FocusListener listener = new FocusListener() {
      public void focusGained(FocusEvent e) {
        dumpInfo(e);
      }

      public void focusLost(FocusEvent e) {
        dumpInfo(e);
      }

      private void dumpInfo(FocusEvent e) {
        System.out.println("Source  : " + name(e.getComponent()));
        System.out.println("Opposite : "
            + name(e.getOppositeComponent()));
        System.out.println("Temporary: " + e.isTemporary());
      }

      private String name(Component c) {
        return (c == null) ? null : c.getName();
      }
    };

    // First
    JPanel panel = new JPanel();
    JLabel label = new JLabel("Label 1: ");
    JTextField text = new JTextField("Type your text", 15);
    text.setName("First");
    text.addFocusListener(listener);
    label.setDisplayedMnemonic(KeyEvent.VK_1);
    label.setLabelFor(text);
    panel.add(label);
    panel.add(text);
    contentPane.add(panel, BorderLayout.NORTH);

    // Second
    panel = new JPanel();
    label = new JLabel("Label 2: ");
    text = new JTextField("14.0", 10);
    text.setName("Second");
    text.addFocusListener(listener);
    text.setHorizontalAlignment(JTextField.RIGHT);
    label.setDisplayedMnemonic(KeyEvent.VK_2);
    label.setLabelFor(text);
    panel.add(label);
    panel.add(text);
    contentPane.add(panel, BorderLayout.SOUTH);

    frame.pack();
    frame.show();
  }
}

1.	Demonstrating the WindowListener with a WindowAdapter
2.	Demonstrating the ActionListener
3.	Demonstrating the AdjustmentListener
4.	Demonstrating the AncestorListener
5.	Demonstrating the ComponentListener
6.	Demonstrating the ContainerListener
7.	Demonstrating the HyperlinkListener
8.	Demonstrating the InternalFrameListener
9.	Demonstrating the ItemListener
10.	Demonstrating the KeyListener
11.	Demonstrating the MenuListener
12.	Demonstrating the MouseListener and MouseMotionListener
13.	Demonstrating the MouseWheelListener
14.	Demonstrating the PopupMenuListener
15.	Demonstrating the WindowListener
16.	Responding to Keystrokes

Demonstrating the FocusListener : Various Event Listener « Swing JFC « Java

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