用java模拟写字板程序

源程序代码：

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import java.awt.Color;   
import java.awt.Container;   
import java.awt.FlowLayout;   
import java.awt.Graphics;   
import java.awt.event.MouseEvent;   
import java.awt.event.MouseListener;   
import java.awt.event.MouseMotionAdapter;   
  
import javax.swing.ButtonGroup;   
import javax.swing.JButton;   
import javax.swing.JFrame;   
import javax.swing.JRadioButton;   
  
//####################################   
//可能有时候程序运行后什么也没有，你需要鼠标在屏幕上移动下才能出现按钮，   
//至于为什么，本鸟不懂～～以后有待研究   
//######################################   
public class testEventMouse extends JFrame{  //主类，继承JFrame类，因为要用到paint()方法，所以   
    //必须继承一个Frame类，否则我这个初学者还没学到其他可以调用paint()的方法   
    Container contentPanel; //内容格引用   
    JButton b1,b2,b3,b4,b5;//这是五个按钮   
    JRadioButton backGroundRadio,foreGroundRadio;  //定义两个单选框   
    ButtonGroup radioGroup;  //单选按钮组   
    int xValue,yValue;  //保留鼠标位置（x,y）   
    JFrame jf=this;//把当前对象赋值给jf，因为我后来调代码的时候发现，背景色是内容格或者说是其它组件   
    //来管理的，Frame框架类是不管理背景色的；但是我之所以要获取JFrame的对象，是因为前景色只有框架类   
    //能够管理，其它的组件没有资格来管理；后面做事件处理的话，你会发现   
       
    public testEventMouse(){ //构造函数   
        super("08计本 曹锋--模拟写字板");   
        b1=new JButton("Black");//实现五个按钮   
        b2=new JButton("Blue");   
        b3=new JButton("Red");   
        b4=new JButton("White");   
        b5=new JButton("Yellow");   
        contentPanel=this.getContentPane();//获取内容格   
        contentPanel.setLayout(new FlowLayout());//设置内容格的布局管理器   
           
        backGroundRadio=new JRadioButton("backGround"); //实例化复选框   
        foreGroundRadio=new JRadioButton("foreGround");   
           
        contentPanel.add(backGroundRadio);//添加到内容格里面去   
        contentPanel.add(foreGroundRadio);   
           
        contentPanel.add(b1);//添加按钮   
        contentPanel.add(b2);   
        contentPanel.add(b3);   
        contentPanel.add(b4);   
        contentPanel.add(b5);   
           
        MouseListenerHandler mou=new MouseListenerHandler(); //实现一个事件监听类   
        b1.addMouseListener(mou); //注册为五个按钮的监听者   
        b2.addMouseListener(mou);   
        b3.addMouseListener(mou);   
        b4.addMouseListener(mou);   
        b5.addMouseListener(mou);   
           
        radioGroup=new ButtonGroup(); //实例单选按钮组   
        radioGroup.add(backGroundRadio);//将两个radio按钮构成一个组   
        radioGroup.add(foreGroundRadio);   
           
           
        addMouseMotionListener(  //匿名类   
                new MouseMotionAdapter(){  //因为是当前一个对象调用，所以搞了个适配器玩玩   
                    public void mouseDragged(MouseEvent e){   
                        xValue=e.getX();   
                        yValue=e.getY();   
                        repaint();  //调用paint()方法   
                    }   
                }   
                );   
        setSize(1000,500);  //要搞就要搞大的   
        setVisible(true);  //设置可见   
    }   
       
    public class MouseListenerHandler implements MouseListener{  //鼠标事件监听类   
        public void mousePressed(MouseEvent e){  //其实只有一个有用的，就是鼠标点击事件   
                                                 //因为要监听的对象比较多，所以用适配器不好   
            if(e.getSource()==b1){   //用getSouce()获取对象   
                if(backGroundRadio.isSelected())   
                    contentPanel.setBackground(Color.BLACK);//重点来了，用内容格来设置背景色   
                else                                 //#####################   
                    jf.setForeground(Color.BLACK);   //用Frame框架来设置前景色   
            }   
            if(e.getSource()==b2){   
                if(backGroundRadio.isSelected())   
                    contentPanel.setBackground(Color.BLUE);   
                else  
                    jf.setForeground(Color.BLUE);   
            }   
            if(e.getSource()==b3){   
                if(backGroundRadio.isSelected())   
                    contentPanel.setBackground(Color.RED);   
                else  
                    jf.setForeground(Color.RED);   
            }   
            if(e.getSource()==b4){   
                if(backGroundRadio.isSelected())   
                    contentPanel.setBackground(Color.WHITE);   
                else  
                    jf.setForeground(Color.WHITE);   
            }   
            if(e.getSource()==b5){   
                if(backGroundRadio.isSelected())   
                    contentPanel.setBackground(Color.YELLOW);   
                else  
                    jf.setForeground(Color.YELLOW);   
            }      
        }   
        public void mouseClicked(MouseEvent e) {    //下面东西没用，但是作为接口方法，空实现下     
        }   
        public void mouseEntered(MouseEvent e) {           
        }   
        public void mouseExited(MouseEvent e) {        
        }   
        public void mouseReleased(MouseEvent e) {          
        }   
}   
       
       
    public void paint(Graphics g){  //画些小圆，来迷惑人的肉眼，呵呵   
        g.fillOval(xValue, yValue, 4, 4); //画圆   
    }   
       
    public static void main(String args[]){   
        new testEventMouse(); //匿名类   
    }   
}