吃豆人无法同时绘制多个图案

Question

//运行程序的类
public class GUI {
    public static void main(String[] args) {
        new Initialize();

    }
}

//gui窗体类
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Initialize implements Awt_Define{
    public Initialize() {
        jframe.setTitle("控件自动移动测试程序");
        jframe.setBounds(0, 0, 600, 600);
        jframe.setVisible(true);

        jframe.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        jframe.add(peason);
        thread_p.start();

        jframe.add(beans);
        thread_b.start();

    }
}

//吃豆人的人

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

public class Peason extends Canvas implements Runnable, Awt_Define{
        int x=0,y=0;
        int a=0,b=0;
        Graphics g ;

        @Override
        public void run() {
            g = getGraphics();
            while(true) {
                try {
                    Thread.sleep(1000);//通过控制休眠速度以临时解决闪烁问题
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                this.update(g);
                peason.requestFocus();
                peason.addKeyListener(new KeyAdapter() {
                    @Override
                    public void keyPressed(KeyEvent e) {
                        if (e.getKeyCode() == KeyEvent.VK_DOWN ||
                                e.getKeyCode() == KeyEvent.VK_UP ) {
                            a = 0;
                            if ((e.getKeyCode() == KeyEvent.VK_DOWN) )
                                b = 10;

                            else if((e.getKeyCode() == KeyEvent.VK_UP))
                                b = -10;
                        }

                        if (e.getKeyCode() == KeyEvent.VK_LEFT ||
                                e.getKeyCode() == KeyEvent.VK_RIGHT) {
                            b = 0;
                            if (e.getKeyCode() == KeyEvent.VK_LEFT)
                                a = -10;

                            else
                                a = 10;
                        }
//                        peason.paint(g);

                    }

                });

                g.setColor(Color.GREEN);
                g.fillRect(x+=a,y+=b, 20, 20);
                System.out.println("X = " + x +"y = " + y);

            }
        }

}

//豆子
import java.awt.*;

public class Beans extends Canvas implements Awt_Define,Runnable{

    @Override
    public void run() {
        int x,y;
        while (true){
            x = random.nextInt(550);
            y = random.nextInt(550);
            Graphics g = getGraphics();

            g.setColor(Color.CYAN);
            g.fillOval(x, y, 10, 10);

            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            beans.update(g);
        }
    }
}

//继承接口
import javax.swing.*;
import java.awt.*;
import java.util.Random;

interface Awt_Define{

    JFrame jframe = new JFrame();
    Panel panel = new Panel();
    Peason peason = new Peason();
    Beans beans = new Beans();
    Random random = new Random();
    Thread thread_p = new Thread(peason);
    Thread thread_b = new Thread(beans);

}

问题：单独运行两个类（豆子和人）正常运行，但是现在无法实现两个类同时运行，使用多线程，只会画出一个类（豆子或人），请问应该如何解决

Answer 1

你得两个一起画啊。画布只有一张，你现在两个完全独立，在画布上只能画一个，另一个就会被覆盖掉。你得在一张画布上同时画两个