线程重绘打开新窗口

Question

我正在使用java制作一个简单的游戏。我有每秒四十次的代码，运行屏幕线程。但是，每当我调用屏幕线程时，都会打开一个新窗口，旧窗口也会保持打开状态。有没有办法解决这个问题？感谢

package sylvyrfysh;

import java.awt.*;
import javax.swing.*;
import sylvyrfysh.handlers.OreHandler;
import sylvyrfysh.troops.manager.TroopManager;

public class Screen extends JFrame implements Runnable{
    private static final long serialVersionUID = -377919050238217712L;
    public Screen(){
        super("Commander");
        setContentPane(new DrawPane());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setFont(new Font("Arial",Font.PLAIN,12));
        setSize(607,669);
        setVisible(true);
        setResizable(false);
        KeyboardFocusManager manager=KeyboardFocusManager.getCurrentKeyboardFocusManager();
        manager.addKeyEventDispatcher(new EventHandler());
        addMouseListener(new MouseHandler());
    }
    class DrawPane extends JPanel{
        private static final long serialVersionUID = 2729138328693556841L;
        public void paintComponent(Graphics g){
            g.setColor(Color.BLACK);
            g.fillRect(0,0,600,40);
            g.setColor(Color.CYAN);
            g.drawString("Ore: "+Main.ore,0,10);
            g.drawString("Base Health: "+Main.baseHealth,0,30);
            g.setColor(Color.BLUE);
            g.fillRect(0,40,600,600);
            g.setColor(Color.GREEN);
            g.fillRect(0,40,100,100);
            for(int[] i:TroopManager.troops){
                g.fillRect(i[1],i[2]+40,1,1);
            }
            g.setColor(Color.RED);
            g.fillRect(500, 540, 100, 100);
            for(int[] i:TroopManager.enemyTroops){
                g.fillRect(i[1],i[2]+40,1,1);
            }
            g.setColor(Color.YELLOW);
            for(int[] i:OreHandler.ore){
                g.fillRect(i[1],i[2]+40,1,1);
            }
        }
    }
    public void run(){repaint();}
}

编辑：似乎正在发生的事情是每当我调用屏幕线程时，它也会调用构造函数。