<span style="font-family:KaiTi_GB2312;font-size:18px;">import java.awt.Container; 
 
import javax.swing.BoxLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.UIManager; 
 
public class BoxLayoutDemo { 
  public static void main(String[] args) { 
    try { 
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
    } catch (Exception e) { 
    } 
    JFrame frame = new JFrame("BoxLayout Test"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    Container panel = frame.getContentPane(); 
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS)); 
    for (float align = 0.0f; align <= 1.0f; align += 0.25f) { 
      JButton button = new JButton("X align = " + align); 
      button.setAlignmentX(align); 
      panel.add(button); 
    } 
    frame.setSize(400, 300); 
    frame.setVisible(true); 
  } 
 
} 
</span>