java - 在Java游戏中实现暂停/恢复功能

Question

我已成功使用 *running = !running 暂停游戏

但是如果使用这个就无法取消暂停

并且 thread.resume() 或 thread.wait() 也无法在按下“P”时取消暂停

private volatile boolean running;
private Thread thread;

public static enum STATE {
    MENU,
    GAME,
};

public static STATE State = STATE.MENU;

public void init(){
    requestFocus();
}

private synchronized void start(){
    if(running)
        return;

    running = true;
    thread = new Thread(this);
    thread.start();
}

private synchronized void stop(){
    if(!running)
        return;

    running = false;
    try{
        thread.join();
    }catch(InterruptedException e){
        e.printStackTrace();
    }
}

public void run() {
    init();

    while(running){
        /some codes
    }
    stop();
}

private void render(){

    if(State == STATE.GAME){
        p.render(g);
        c.render(g);

    }else if(State == STATE.MENU){
        menu.render(g);
    }

    g.dispose();
    bs.show();
}

public void keyPressed(KeyEvent e){
    int key = e.getKeyCode();

    if(State == STATE.GAME){
    if(key == KeyEvent.VK_RIGHT){
        p.setVelX(5);
    }else if(key == KeyEvent.VK_LEFT){
        p.setVelX(-5);
    }else if(key == KeyEvent.VK_DOWN){
        p.setVelY(5);
    }else if(key == KeyEvent.VK_UP){
        p.setVelY(-5);
    }else if(key == KeyEvent.VK_SPACE && !is_shooting){
        c.addEntity(new Bullet(p.getX(), p.getY(), tex, this));
        is_shooting = true;
    }else if(key == KeyEvent.VK_P){

这一行是暂停。

        running = !running;
    }
    }
}

public void keyReleased(KeyEvent e){
    int key = e.getKeyCode();

    if(key == KeyEvent.VK_RIGHT){
        p.setVelX(0);
    }else if(key == KeyEvent.VK_LEFT){
        p.setVelX(0);
    }else if(key == KeyEvent.VK_DOWN){
        p.setVelY(0);
    }else if(key == KeyEvent.VK_UP){
        p.setVelY(0);
    }else if(key == KeyEvent.VK_SPACE){
        is_shooting = false;
    }else if(key == KeyEvent.VK_P){


// This line doesn't work.

        running = true;
    }
}

Answer 1

目前，一旦 running 设置为 false，您的游戏线程就会退出(run() 方法返回)。

public void run() {
    init();
    while(running){
        /some codes
    }
    stop();
}

应该改成这样:

public void run() {
    init();
    while(true){
        if(!running) {
            Thread.sleep(1000);  //1 second or something else
            continue;
        }
        //Game logic here
    }
    stop();
}

您当然需要区分运行和暂停，以便能够跳出此循环。