新手请问大家一个图形程序。。。

[fireonice7]

//在Frame中用鼠标点击画出点。

import java.awt.*;
import java.awt.event.*;
import java.util.*;


public class MouseAdapter {
public static void main(String[] args)
{
new MyFrame("drawing points");}
}

class MyFrame extends Frame{
ArrayList <Point>points=null;//ArrayList(int initialCapacity) 构造一个具有指定初始容量的空列表
MyFrame(String s)
{super(s);
points=new ArrayList();
setLayout(null);
this.setBackground(new Color(200,200,200));
this.setVisible(true);
this.addMouseListener((MouseListener) new Monitor());
}



public void paint(Graphics g)
{Iterator <Point>l=points.iterator();
while(l.hasNext())
{Point p = (Point)l.next();
g.setColor(Color.blue);
g.fillOval(p.x, p.y, 10,20);
}
}

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();}
}
能运行，但点击时并没有出现点。请大家赐教！

[lz12366007]

记得有人发过！！和1#的一样！！我就不发了

[swandragon]

import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;

public class MouseTest {
	public static void main(String[] args){
		new MyFrame("drawing points");
	}
}

class MyFrame extends Frame{
	ArrayList<Point> points = null;// ArrayList(int initialCapacity) 构造一个具有指定初始容量的空列表
	MyFrame(String s){
		super(s);
		points = new ArrayList();
		setLayout(null);
		this.setBackground(new Color(200,200,200));
		this.addMouseListener(new Monitor());
		this.setBounds(300,300,400,300);
		this.setVisible(true);
	}

	public void paint(Graphics g){
		Iterator<Point> l = points.iterator();
		while(l.hasNext()){
			Point p = (Point) l.next();
			g.setColor(Color.blue);
			g.fillOval(p.x,p.y,10,20);
		}
	}

	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();
	}
}

[xucan2087]

学习了