深入浅出java swing程序设计

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				
				public class FillerB1 {
				     
				    public FillerB1() {
				    
				    	JFrame f = new JFrame();
				    	
				        Container contentPane = f.getContentPane();
				        Box baseBox = Box.createHorizontalBox();
				        contentPane.add(baseBox);
				        baseBox.add(new JButton("A"));  
				        baseBox.add(new Box.Filler(new Dimension(50,50),
				                                   new Dimension(50,100),
				                                   new Dimension(50,200)));
				        baseBox.add(new JButton("B"));
				
					    f.setTitle("BoxLayout");
					    f.pack();
				        f.setVisible(true);
				        
				        f.addWindowListener(new WindowAdapter() {
				            public void windowClosing(WindowEvent e) {
				                    System.exit(0);
				            }
				        });
				    }
				
				    public static void main(String args[]) {
				    
				        FillerB1 b = new FillerB1();
				        
				    }
				}