java例程练习（简单的画图程序[鼠标事件处理]）

//简单的画图程序 
//注意repaint()方法的使用 
import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
public class TestMyMouseAdater { 
    public static void main(String[] args) { 
        new MyFrame("Drawing ......"); 
    } 
} 
 
class MyFrame extends Frame { 
    ArrayList<Point> points = null; 
    MyFrame(String s) { 
        super(s); 
        points = new ArrayList<Point>(); 
        setLayout(null); 
        setBounds(300, 300, 400, 400); 
        setBackground(new Color(204, 204, 255)); 
        setVisible(true); 
        this.addMouseListener(new Monitor()); 
    } 
 
    public void paint(Graphics g) { 
        Iterator<Point> i = points.iterator(); 
        while(i.hasNext()) { 
            Point p = i.next(); 
            g.setColor(Color.blue); 
            g.fillOval(p.x, p.y, 10, 10); 
        } 
    } 
 
    public void addPoint(Point p) { 
        points.add(p); 
    } 
} 
 
class Monitor extends MouseAdapter { 
    public void mousePressed(MouseEvent e) { 
        MyFrame f = (MyFrame)e.getSource(); 
        f.addPoint(new Point(e.getX(), e.getY())); 
        f.repaint(); 
    } 
} 

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补充：软件开发 , Java ,

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