java 如何使用BoxLayout布局管理器

import java.awt.Container; import java.awt.Dimension; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; public class BoxLayout { public BoxLayout() { JFrame f = new JFrame(); Container contentPane = f.getContentPane(); Box baseBox = Box.createHorizontalBox(); contentPane.add(baseBox); baseBox.add(new JButton("A"));//定义一个"A"按钮 baseBox.add(new JButton("B"));//定义一个"B"按钮 f.setTitle("BoxLayout"); f.setSize(new Dimension(200, 50));//设置窗口的大小 f.setVisible(true); f.addWindowListener(new WindowAdapter() {//对窗口进行监听 public void windowClosing(WindowEvent e) { System.exit(0); } }); } public static void main(String[] args) { BoxLayout b = new BoxLayout(); } }