Swing フォーカス取得・喪失の取得

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Focustest {
	private static JButton b1;
	private static JButton b2;
	
	public static void main(String[] inArgs) {
		JFrame f = new JFrame("focus test");
		
		Container c = f.getContentPane();
		
		JPanel p = new JPanel(new GridLayout(1, 2));
		c.add(p);
		
		b1 = new JButton("button 1");
		p.add(b1);
		b1.addFocusListener(new FocusListener() {
			public void focusGained(FocusEvent inEvent) {
				System.out.println("button 1 gained the focus");
			}
			
			public void focusLost(FocusEvent inEvent) {
				System.out.println("button 1 lost the focus");
			}
		});
		b1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent inEvent) {
				FocusEvent aEvent = new FocusEvent(b2, FocusEvent.FOCUS_GAINED);
				Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(aEvent);
			}
		});
		
		b2 = new JButton("button 2");
		p.add(b2);
		b2.addFocusListener(new FocusListener() {
			public void focusGained(FocusEvent inEvent) {
				System.out.println("button 2 gained the focus");
			}
			
			public void focusLost(FocusEvent inEvent) {
				System.out.println("button 2 lost the focus");
			}
		});
		b2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent inEvent) {
				FocusEvent aEvent = new FocusEvent(b1, FocusEvent.FOCUS_GAINED);
				Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(aEvent);
			}
		});
		
		f.pack();
		f.show();
	}

}