popupmenudemo.java

电子工业出版社出版的《java2应用开发指南》配套光盘源代码

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

public class PopupMenuDemo extends JFrame
{
	public PopupMenuDemo(String strTitle)
	{
		//设置框架窗体标题
		super(strTitle);
		
		//创建弹出式菜单
		final JPopupMenu mnuRoot=new JPopupMenu();
		mnuRoot.add( new JMenuItem("新建",new ImageIcon("new.gif")));
		mnuRoot.add( new JMenuItem("保存",new ImageIcon("save.gif")));
		mnuRoot.add( new JMenuItem("打印",new ImageIcon("print.gif")));
		
		final JLabel label=new JLabel("单击我来噢",JLabel.CENTER);
		label.addMouseListener(new MouseAdapter(){
			public void mousePressed(MouseEvent e)
			{
				mnuRoot.show(label,e.getX(),e.getY());
			}
		});
		
		
		this.getContentPane().add(label);
	}
	
	//设置框架窗体的大小为宽400，高为400
	public Dimension getPreferredSize()
	{
		return new Dimension(400,400);		
	}
	
	//程序的入口方法
	public static void main( String[] args )
	{
		//创建框架窗体
		PopupMenuDemo frame=new PopupMenuDemo("这是个使用弹出式菜单的例子");
		
		//设置框架窗体的事件监听(关闭窗体事件)
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
		
		//显示框架窗体
		frame.pack();
		frame.show();
		
	}
}