boxlayoutdemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例6.4.5 BoxLayoutDemo.java
	import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class BoxLayoutDemo
{
		private JFrame jframe;
		private JPanel jpl;
		public BoxLayoutDemo()
{
			jframe = new JFrame("BoxLayout演示窗口");
			Container c = jframe.getContentPane();
		
			jpl = new Jpanel();
			c.add(jpl);
		
			jframe.setSize(200,150);
			jframe.setVisible(true);
			jframe.addWindowListener(new WindowAdapter(){
				public void windowClosing(WindowEvent e){
					System.exit(0);
				}
			});
		}
		public static void main(String[] args)
{
			new BoxLayoutDemo();
		}
}
class Jpanel extends JPanel
{
		JButton jb1,jb2,jb3,jb4;
		Jpanel()
{
// 指定布局管理器为BoxLayout，其中this表示当前面板对象
			setLayout(new BoxLayout(this,BoxLayout.Y_AXIS)); 
			jb1 = new JButton("按钮1");
			jb2 = new JButton("按钮2");
			jb3 = new JButton("按钮3");
			jb4 = new JButton("按钮4");
			add(jb1);add(jb2);add(jb3);add(jb4);
		}
}