Java项目图片未加载出现

问题遇到的现象和发生背景

Java实战项目

MyFish在游戏开始后加载不出来

窗口代码

package com.ynl;

import javax.swing.;
import java.awt.;
import java.awt.event.*;
public class GameWin extends JFrame{
/*游戏状态 0未开始，1游戏中，2通关失败，3通关成功，4暂停/

//游戏默认状态
static int state = 0;

Image offScreenImage;
//窗口大小
int width = 1209;
int height = 754;

double random;
//计数器
int time = 0;


//背景类的队像
Bg bg = new Bg();

//敌方鱼类
Enamy enamy;

//我方鱼类
MyFish myFish = new MyFish();

public void launch(){
    //设置窗口是否可见
    this.setVisible(true);
    //设置窗口大小
    this.setSize(width,height);
    //设置窗口在屏幕的居中位置
    //this.setLocation(null);
    //设置游戏窗口不可改变
    //this.setResizable(false);
    //设置窗口标题
    this.setTitle("YNL");
    //设置关闭窗口按钮
    this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    this.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
            super.mouseClicked(e);
            if(e.getButton() == 1&&state == 0){
                state = 1;
                repaint();
            }
        }
    });

    //键盘监视器的运用
    this.addKeyListener(new KeyAdapter() {
        @Override
        public void keyTyped(KeyEvent e) {
            super.keyTyped(e);

        }

        @Override
        public void keyPressed(KeyEvent e) {
            super.keyPressed(e);
            if(e.getKeyCode() == 87){
                GameUtils.UP = true;
                System.out.println("W");
            }
            if(e.getKeyCode() == 83){
                GameUtils.DOWN = true;
                System.out.println("S");
            }
            if(e.getKeyCode() == 65){
                GameUtils.LEFT = true;
                System.out.println("D");
            }
            if(e.getKeyCode() == 63){
                GameUtils.RIGHT = true;
                System.out.println("A");
            }
        }

        @Override
        public void keyReleased(KeyEvent e) {
            //super.keyReleased(e);
            if(e.getKeyCode() == 87){
                GameUtils.UP = false;
            }
            if(e.getKeyCode() == 83){
                GameUtils.DOWN = false;
            }
            if(e.getKeyCode() == 65){
                GameUtils.LEFT = false;
            }
            if(e.getKeyCode() == 63){
                GameUtils.RIGHT = false;
            }
        }
    });

    //背景图片需要重复使用，因此需要加上循环（该循环是每隔40秒调用1次）
    /**加上while循环后其实页面会出现文字闪动的情况，需双缓存解决*/
    while(true){
        repaint();
        time++;
        try {
            Thread.sleep(40);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

@Override
public void paint(Graphics g) {
    //加载模式初始化对象
    offScreenImage = createImage(width,height);
    Graphics gImage = offScreenImage.getGraphics();

    //g.drawImage(GameUtils.bgimg,0,0,null);

    switch (state){
        case 0:
            //启动背景图片
            gImage.drawImage(GameUtils.bgimg,0,0,null);
            //将画笔颜色改为粉色
            gImage.setColor(Color.pink);
            //设置字体样式
            gImage.setFont(new Font("仿宋",Font.BOLD,60));
            //为启动页面添加文字
            gImage.drawString("开始",555,425);
            //gImage.requestFocus();
            break;
        case 1:
            bg.paintSelf(gImage);//加载开始页面的图片
            myFish.paintSelf(gImage);
            logic();
            for (Enamy enamy:GameUtils.EnamyList) {
                enamy.paintSelf(gImage);
            }
            break;
        case 2:
            break;
        case 3:
            break;
        case 4:
            break;
        default:
    }

    g.drawImage(offScreenImage,0,0,null);
}


void  logic(){
    //敌方鱼的生成
    if(time % 10 == 0){
        enamy = new Enamy_1_L();
        GameUtils.EnamyList.add(enamy);
    }
    //敌方鱼的方向
    for (Enamy enamy:GameUtils.EnamyList){
        enamy.x = enamy.x + enamy.dir * enamy.speed;
    }
}
//main方法
public static void main(String[] args) {
    GameWin gameWin = new GameWin();
    gameWin.launch();
}

}

图片覆盖问题，类似图层