降低滴答声以降低游戏速度会导致输入滞后

Question

我用Java编写了一个蛇游戏。问题在于the虫快了，因为我的蛇发疯了。

我试图通过降低时钟频率来降低​​游戏速度。现在，游戏感觉很迟钝，输入延迟很大。我该如何解决？

import javax.swing.*;

public class Main {
    public Main() {
        JFrame frame = new JFrame();
        Gamepanel gamepanel = new Gamepanel();

        frame.add(gamepanel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Snake Game v1.0");
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new Main();
    }
}



import java.awt.Color;
import java.awt.*;

public class Bodypart {

    private int xCoor, yCoor, width, height;

    public Bodypart(int xCoor, int yCoor, int tileSize) {
        this.xCoor = xCoor;
        this.yCoor = yCoor;
        width = tileSize;
        height = tileSize;
    }

    public void tick() {

    }
    public void draw(Graphics g) {
        g.setColor(Color.YELLOW);
        g.fillRect(xCoor * width, yCoor * height, width, height);
    }

    public int getxCoor() {
        return xCoor;
    }

    public void setxCoor(int xCoor) {
        this.xCoor = xCoor;
    }

    public int getyCoor() {
        return yCoor;
    }

    public void setyCoor(int yCoor) {
        this.yCoor = yCoor;
    }

}


import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Random;

import javax.swing.JPanel;

public class Gamepanel extends JPanel implements Runnable, KeyListener{


    private static final long serialVersionUID = 1L;

    public static final int WIDTH = 500, HEIGHT = 500;

    private Thread thread;

    private boolean running;

    private boolean right = true, left = false, up = false, down = false;

    private Bodypart b;
    private ArrayList<Bodypart> snake;

    private Apple apple;
    private ArrayList<Apple> apples;

    private Random r;

    private int xCoor = 10, yCoor = 10, size = 15;
    private int ticks = 0;


    public Gamepanel() {
        setFocusable(true);

        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        addKeyListener(this);

        snake = new ArrayList<Bodypart>();
        apples = new ArrayList<Apple>();

        r = new Random();

        start();
    }


    public void start() {
        running = true;
        thread = new Thread(this);
        thread.start();

    }
    public void stop() {
        running = false;
        try {
            thread.join();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public void tick() {
        if(snake.size() == 0) {
            b = new Bodypart (xCoor, yCoor, 10);
            snake.add(b);
        }

            if(right) xCoor++;
            if(left) xCoor--;
            if(up) yCoor--;
            if(down) yCoor++;

            ticks = 0;

            b = new Bodypart(xCoor, yCoor, 10);
            snake.add(b);

            if(snake.size() > size) {
                snake.remove(0);
            }

        if(apples.size() ==0) {
            int xCoor = r.nextInt(49);
            int yCoor = r.nextInt(49);

            apple = new Apple(xCoor, yCoor, 10);
            apples.add(apple);
        }

        for(int i = 0 ; i < apples.size() ; i++) {
            if(xCoor == apples.get(i).getxCoor() && yCoor == apples.get(i).getyCoor()) {
                size++;
                apples.remove(i);
                i++;
            }
        }
        //collosion on snake border body part
        for(int i = 0 ; i < snake.size(); i++) {
            if(xCoor == snake.get(i).getxCoor() && yCoor == snake.get(i).getyCoor()) {
                if(i !=snake.size()- 1) {
                    System.out.println();
                    stop();
                }
            }
        }

        //collision on border
        if(xCoor < 0 || xCoor > 49 || yCoor < 0 || yCoor > 49) {
            System.out.println("Game Over");
            stop();
        }

    }
    public void paint(Graphics g) {
        g.clearRect(0, 0, WIDTH, HEIGHT);

        g.setColor(Color.BLACK);
        g.fillRect(0, 0, WIDTH, HEIGHT);
        for(int i = 0; i < WIDTH/10 ; i++) {
            g.drawLine(i * 10, 0, i *10, HEIGHT);
        }
        for(int i = 0; i < HEIGHT/10 ; i++) {
            g.drawLine(0, i * 10 , HEIGHT, i * 10);
        }
        for(int i = 0 ; i <snake.size(); i++) {
            snake.get(i).draw(g);
        }
        for(int i = 0 ; i < apples.size(); i++) {
            apples.get(i).draw(g);
        }

    }


    @Override
    public void run() {
        long lastTime = System.nanoTime();
        final double amountofTicks = 20D;
        double ns = 1000000000 / amountofTicks;
        double delta = 0;
        while(running) {
            long now = System.nanoTime();
            delta += (now-lastTime) / ns;
            lastTime = now;
            if(delta >= 1) {
                tick();
                delta--;
            }
            repaint();
        }
        stop();
    }


    @Override
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if(key == KeyEvent.VK_RIGHT && !left) {
            right = true;
            up = false;
            down = false;
        }
        if(key == KeyEvent.VK_LEFT && !right) {
            left = true;
            up = false;
            down = false;
        }
        if(key == KeyEvent.VK_UP && !down) {
            up = true;
            left = false;
            right = false;
        }
        if(key == KeyEvent.VK_DOWN && !up) {
            down = true;
            left = false;
            right = false;
        }
    }


    @Override
    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }


    @Override
    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }

}

我不知道如何改善输入延迟。 有人可以帮忙吗？