个人学习KeyListener、MouseListener、WindowListener

import java.awt.*;
import javax.swing.*;
public class MyPanel extends JPanel{
	RectClass rectClass = null;
	public MyPanel(){
		rectClass = RectClass.returnRectClass();
	}
	public void paint(Graphics g){
		super.paint(g);
		
		this.drawRect(rectClass.getX(), rectClass.getY(), rectClass.getWidth(), rectClass.getHeight(), g);
	}
	public void drawRect(int x1, int y1, int x2, int y2,Graphics g){
		g.fillRect(x1, y1, x2, y2);
		this.repaint();
	}
	//创建MyPanel对象，return函数方便其他函数调用。
	private static MyPanel mypanel = new MyPanel();
	public static MyPane