JAVA做WINDOWS画图板的源程序？

楼上的代码我做了一点点改正，我想现在可以正常运行了：
//#8.15
//#filename: ShapeMain.java
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
//import javax.swing.Component;

public class ShapeMain extends JFrame implements ActionListener,MouseListener,MouseMotionListener{
int x,y,x1,y1,x2,y2,width,height;
boolean isFirstPoint = true;
//初始化开始画的是线
int drawType = PaintingGround.LINE;
//初始化开始不是填