请求大佬支援！！为什么我的图片加载不出？

Question

package tabletennis;

import java.awt.*;
import javax.swing.*;

public class BallGame extends JFrame{
    //加载图片
    Image ball = Toolkit.getDefaultToolkit().getImage("img/ball.png");
    Image desk = Toolkit.getDefaultToolkit().getImage("img/desk.jpg");

    //画窗口方法
    public void paint(Graphics g) {
         System.out.println("窗口被画了一次!");
         g.drawImage(desk,0,0,null);
         g.drawImage(ball,100,100,null);
    }

    //窗口加载
    void launchFrame() {
        setSize(300,300);
        setLocation(856,500);
        setVisible(true);
    }

    public static void main(String[] args) {
        BallGame ballgame = new BallGame();
        ballgame.launchFrame();
    }
}

Answer 1

你没调用paint方法啊