import java.awt.*;

public class GUITest {
    public static void main(String[] args){
        Frame f = new Frame("我是标题栏");
        Panel p = new Panel();
        Panel p2 = new Panel();

        f.setSize(300,200);
        f.setBackground(Color.PINK);
       f.setLayout(new GridLayout(2,1));
     //   f.setLayout(new FlowLayout(FlowLayout.CENTER,100,100));

        Panel pp = new Panel();
        p.setLayout(new BorderLayout());
        p.add(new MyButton("cancel",100,100),BorderLayout.EAST);
        p.add(new MyButton("cancel",100,100),BorderLayout.WEST);

        pp.setLayout(new GridLayout(2,1));
        pp.add(new MyButton("cancel",100,100));
        pp.add(new MyButton("cancel",100,100));
        p.add(pp,BorderLayout.CENTER);




        Panel pp2 = new Panel();
        p2.setLayout(new BorderLayout());
        p2.add(new MyButton("cancel",100,100),BorderLayout.EAST);
        p2.add(new MyButton("cancel",100,100),BorderLayout.WEST);

        pp2.setLayout(new GridLayout(2,2));
        pp2.add(new MyButton("cancel",100,100));
        pp2.add(new MyButton("cancel",100,100));
        pp2.add(new MyButton("cancel",100,100));
        pp2.add(new MyButton("cancel",100,100));
        p2.add(pp2,BorderLayout.CENTER);




        //  p.setLayout(null);
      //  p.setVisible(true);

        f.add(p);
        f.add(p2);

       // f.pack();
        f.setVisible(true);

        System.out.println("HelloGUI");
    }
}

class MyButton extends Button {

    MyButton(String title,int width,int height){
        super(title);
       // setSize(width,height);
    }
}

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.awt.event.KeyEvent.*;

public class GUIPaint {
    public static void main(String[] args){
        new YourFrame("这是标题",200,200,800,800);
    }
}
class YourFrame extends Frame {
    ArrayList<Point> points = null;
    YourFrame(String title,int x,int y,int width,int height){
        super(title);
        points = new ArrayList<>();
        setBounds(x,y,width,height);

        addMouseListener(new YourFrameMouseListener());
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                super.keyPressed(e);
                switch (e.getKeyCode()){
                    case KeyEvent.VK_UP:
                        System.out.println("UP");
                        break;
                    case KeyEvent.VK_DOWN:
                        System.out.println("DOWN");
                        break;
                    case KeyEvent.VK_LEFT:
                        System.out.println("LEFT");
                        break;
                    case KeyEvent.VK_RIGHT:
                        System.out.println("RIGHT");
                        break;
                }

                System.out.println("Key 键盘事件发生 键：" + e.getKeyChar());
            }
        });
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                setVisible(false);
                System.out.println(e);
                System.exit(0);
            }
        });

        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Color c = g.getColor();

        Iterator<Point> pIter = points.iterator(); //取存放Point点的ArrayList的容器的游标
        Point p = null;
        g.setColor(Color.BLACK);
        while(pIter.hasNext()){ //利用游标取出所有的Point  panit函数每次调用需要重新画出所有的points容器中的对象
           p = pIter.next();
           g.fillOval(p.x-(50/2),p.y-(50/2),50,50);
        }

        g.setColor(c);

    }
    //Adapter已经帮助实现了所有的事件响应方法，继承只需要重写自己需要重写的方法的部分，
    // 否则必须自己实现所有的方法
    class YourFrameMouseListener extends MouseAdapter {
        @Override
        public void mousePressed(MouseEvent e) {
            Point p = new Point(e.getX(),e.getY());
            points.add(p);
            repaint();
        }
    }
}