java GUI编程之paint绘制操作示例

import java.awt.*;
public class Testpint {
    public static void main(String[] args) {
//        new TFPaint().lunchPaint();
        new TFPaint();
    }
}
class TFPaint extends Frame{
    /*
    public void lunchPaint() {
        this.setBounds(200, 200, 640, 640);
        this.setBackground(Color.BLUE);
        this.setVisible(true);
    }
    */
    TFPaint(){
        this.setBounds(200, 200, 200, 200);
        this.setBackground(Color.BLUE);
        this.setVisible(true);
    }
    public void paint(Graphics g) {
        Color c = g.getColor();
        g.setColor(Color.BLACK);
        g.fillRect(60, 60, 30, 30);
        g.setColor(Color.CYAN);
        g.fillOval(80, 80, 40, 40);
        g.setColor(c);
    }
}

import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class TestPaint2 {
    public static void main(String[] args) {
        new TFpaint("Draw");
    }
}
class TFpaint extends Frame{
    ArrayList pointList = null;
    TFpaint(String s){
        super(s);
        pointList = new ArrayList();
        this.setLayout(null);
        this.setBounds(200, 200, 400, 400);
        this.setBackground(Color.blue);
        this.setVisible(true);
        this.addMouseListener(new MyMouseMonitor());
    }
    public void paint(Graphics g ) {
        Iterator i = pointList.iterator();
        while(i.hasNext()) {
            Point p = (Point)i.next();
            g.setColor(Color.BLACK);
            g.fillOval(p.x, p.y, 10, 10);
        }
    }
    public void addPoint(Point p) {
        pointList.add(p);
    }
}
class MyMouseMonitor extends MouseAdapter{
    public void mousePressed(MouseEvent e) {
        TFpaint f = (TFpaint) e.getSource();
        f.addPoint(new Point(e.getX(),e.getY()));
        f.repaint();
    }
}