example6_8.java

主要是对于JAVA的编程的基本语言 希望能够帮得上你。

package ForTest;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

//主类
public class Example6_8 extends Applet{
	public void init(){
		MyWindow myWindow=new MyWindow("鼠标事件示例程序");
	}
}

//窗口类
class MyWindow extends JFrame implements MouseListener{
	
	JTextArea text;
	MyPanel panel;
	int x,y,r=10;
	int mouseFlag=0;
	static String mouseStates[]={"鼠标按下","鼠标松开","鼠标进来",
		"鼠标离开","鼠标单击"};
	
	//构造方法
	MyWindow(String s){
		super(s);
		Container con=this.getContentPane();
		con.setLayout(new GridLayout(2,1));
		this.setSize(200,300);
		this.setLocation(100,100);
		panel=new MyPanel();
		con.add(panel);
		text=new JTextArea(10,20);
		text.setBackground(Color.YELLOW);
		con.add(text);
		this.addMouseListener(this);
		this.setVisible(true);
		this.pack();		
	}
	
	public void paint(Graphics g){
		r=r+4;
		if(r>80){
			r=10;
		}
		text.append(mouseStates[mouseFlag]+"了，位置是("+x+", "+y+")\n");
		panel.print(r);
	}

	public void mouseClicked(MouseEvent e) {
		x=e.getX();
		y=e.getY();
		mouseFlag=4;
		repaint();
	}

	public void mouseEntered(MouseEvent e) {
		x=e.getX();
		y=e.getY();
		mouseFlag=2;
		repaint();		
	}

	public void mouseExited(MouseEvent e) {
		x=e.getX();
		y=e.getY();
		mouseFlag=3;
		repaint();		
	}

	public void mousePressed(MouseEvent e) {
		x=e.getX();
		y=e.getY();
		mouseFlag=0;
		repaint();
	}

	public void mouseReleased(MouseEvent e) {
		x=e.getX();
		y=e.getY();
		mouseFlag=1;
		repaint();		
	}	
}

//面板类
class MyPanel extends JPanel{
	public void print(int r){
		Graphics g=this.getGraphics();
		g.clearRect(0,0,this.getWidth(),this.getHeight());
		g.setColor(Color.RED);
		g.fillOval(10, 10, r, r);
	}
}