mouseeventdemo.java

本java源程序包括了大量的学习程序（共27章）方便大家学习

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MouseEventDemo extends JFrame 
{
    private JLabel label;
    private JPanel panel;
    
    public MouseEventDemo() 
    {
    	super("鼠标事件");       
		try
		{      //设置外观
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		}catch(Exception e){}		
		setSize(400, 400);
		
		//获取内容面板
	    Container container = getContentPane();
		container.setBackground(Color.GREEN);
		//创建面板
		panel = new JPanel();
		panel.setPreferredSize(new Dimension(400, 25));
		//创建标签
        label=new JLabel();
        label.setFont(new Font("Serif", Font.PLAIN, 14));
        panel.add(label);
        
       //注册鼠标事件监听器
       container.addMouseListener(new MouseListener() 
       				{       //使用内部匿名类实现
    	   						  //按下鼠标事件处理
           						public void mousePressed(MouseEvent event) 
           						{
        	   						String str = "按住鼠标左键不放,坐标(";
        	   						if(event.isMetaDown())
        		   						str = "按住鼠标右键不放,坐标(";
               					label.setText(str + event.getX() + "," + event.getY() + ")");
           						}	
           
           						//按下并且马上释放鼠标事件处理
           						public void mouseClicked(MouseEvent event) 
           						{
        	   						String str = "鼠标左键单击,坐标(";
        	   						if(event.isMetaDown())
        		   							str = "鼠标右键单击,坐标(";
               					label.setText(str + event.getX() + "," + event.getY() + ")");
           						}
           
           						//拖动鼠标然后释放事件处理
           						public void mouseReleased(MouseEvent event) 
           						{
        	  						String str = "鼠标左键释放,坐标(";
        	  						if(event.isMetaDown())
        		  						str = "鼠标右键释放,坐标(";
              				  label.setText(str + event.getX() + "," + event.getY() + ")");
           						}
           
           						//鼠标移入事件处理
           						public void mouseEntered(MouseEvent event) 
           						{
              					label.setText("鼠标进入窗口");
              					label.setForeground(Color.BLACK);
           						}
           
           						//鼠标移出事件处理
           						public void mouseExited(MouseEvent event) 
           						{
              					label.setText("鼠标移出窗口");
              					label.setForeground(Color.BLACK);
           						}
           			});
       
       container.add(panel, BorderLayout.SOUTH);       
       setVisible(true);
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
  
    public static void main(String args[]) 
    {
        MouseEventDemo application = new MouseEventDemo();
    }
}