ex913.txt

JAVA 基础例题包含了JAVA常见的问题和常见的习题

import java.awt.*;
import java.awt.event.*;
import javax.swing.ImageIcon;
import javax.swing.*;
public class Frame2 extends JFrame implements ActionListener,MouseListener
{	ImageIcon icon=new ImageIcon("ms.jpg");
 	JTextArea msg=new JTextArea();
	JPopupMenu pm=new JPopupMenu();
 	JMenuItem item1=new JMenuItem("hello");
 	JMenuItem item2=new JMenuItem("我是弹出式菜单");
 	JMenuItem item3=new JMenuItem("你会用了吗？");
   	Frame2()
	{	setIconImage(icon.getImage()); 
		setTitle("弹出式菜单");
  		setSize(350,200);
    		Container c=getContentPane();
  		addWindowListener(new WindowAdapter()
						  {   public void windowClosing(WindowEvent e)
								{   System.exit(0);
								}
							});
		c.add(msg);
		msg.add(pm);     //将弹出式菜单加入到文本区中
		pm.add(item1);	
		pm.add(item2);
		pm.add(item3);
		item1.addActionListener(this);
		item2.addActionListener(this);
		item3.addActionListener(this);
		msg.addMouseListener(this);
		show();
	}
	public void actionPerformed(ActionEvent e)
	{	msg.append("你选择了“"+e.getActionCommand()+"”\n");
	}
	  public void mouseReleased(MouseEvent e)
	{	if(e.isPopupTrigger())			//判断是否单击鼠标右键
		//在当前窗口鼠标右键点击的位置显示弹出式菜单	
		pm.show(this,e.getX(),e.getY());
	}
	public void mouseClicked(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mousePressed(MouseEvent e){}
	public static void main(String args[])
	{	new Frame2 ();
	}
}