所以我一直在尝试做一个精灵的对象（称为心脏），可以移动周围的玩家在jpanel“战斗盒”。非常相似的代码在过去对我有用，但奇怪的是现在不行。我需要澄清的是，这是一个项目的一部分，不是全部。从程序的不同部分调用battlebox jpanel对象，尽管从技术上讲，错误可能不在这些类中
另外顺便说一句，并不是所有的代码都是为新的，因为我需要让它出现在第一个之前，我可以开始让它移动，这样的xd无论如何任何帮助的人可以给是感激的，只是以防万一，它不是显而易见的，我自学成才，很抱歉如果答案是超级明显
还有一点小提示，时钟也没有显示，但我已经有点接受命运与这一个了
战斗屏幕类

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JPanel;

import MainMenu.MainMenu;

@SuppressWarnings("serial")
public class BattleScreen extends JPanel {

    private Heart heart;
    private Thread thread;
    private Clock clock;

    public BattleScreen() {

        this.setBounds(0, 0, MainMenu.frame.getWidth(), MainMenu.frame.getHeight());
        this.setBackground(Color.black);

        clock = new Clock(this);

        heart = new Heart();
        heart.allowMovement(true);

        MainMenu.con.add(this);
        this.repaint();
        this.setVisible(true);

        thread = new Thread() {
            public void run() {
                repaint();
            }
        };
        thread.start();
    }

    @Override
    public void paintComponent (Graphics g) {
        super.paintComponent(g);
        heart.draw(g, this);
        clock.draw(g, this);
    }
}

心脏类

import java.awt.Component;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class Heart {

    int xPos, yPos, width, height;
    Thread thread;
    BufferedImage image;

    public Heart() {

        width = 44;
        height = 44;
        xPos = (MainMenu.MainMenu.con.getWidth() - width) / 2;
        yPos = (MainMenu.MainMenu.con.getHeight() - height) / 2;

        try {
            image = ImageIO.read(new File("src/BattleScreen/heart.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        this.setBackground(Color.BLUE);
        this.repaint();

        thread = new Thread() {
            public void run() {
            updateMovement();
        }};
    }

    void draw (Graphics g, Component c) {
        g.drawImage(image, xPos, yPos, width, height, c);
    }
}

过去有效的课程：
旧战网

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JPanel;

import MainMenu.MainMenu;

@SuppressWarnings("serial")
public class BattleScreen extends JPanel implements KeyListener {

    private static JFrame frame = MainMenu.frame;
    static Heart sprite = new Heart(frame.getWidth()/2, frame.getHeight()/2, 20, 20);

    public BattleScreen() {

        addKeyListener(this);
        setFocusable(true);

        setBounds(0, 0, frame.getWidth(), frame.getHeight());
        setBackground(Color.black);
        MainMenu.con.add(this);

        new Thread(() -> {
            while (true) {
                sprite.updateMovement();
                repaint();
                try {
                    Thread.sleep(20);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }

    public void paintComponent (Graphics g) {
        super.paintComponent(g);
        sprite.draw(g, this);
    }
}

旧心脏病

package DEADBattleScreen;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Image;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class Heart {

    Image img;
    int xPos, yPos, width, height;
    Thread thread;

    Heart(int x, int y, int w, int h) {
        this.xPos = x;
        this.yPos = y;
        this.width = w;
        this.height = h;

        try {
            img = ImageIO.read(new File("src/battlescreen/heart.png"));
        } catch (IOException e ) {
            e.printStackTrace();
        }
    }

    void draw (Graphics g, Component c) {
        g.drawImage(img, xPos, yPos, width, height, c);
    }
}