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();
  }
}

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Demonstrating the FocusListener : Various Event Listener « Event « Java

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