类型菜单的“刻度线+渲染”方法未定义

Question

游戏类

private boolean isRunning = false;
private Thread thread;
private Handler handler;
public int hp = 100;
public int ammo = 100;
private Menu menu;

public enum STATE {
    Menu,
    Game

};
public STATE gameState = STATE.Game;

public Game() {
    new Window(800, 600, "Red Ops", this);
    start();
    handler = new Handler();
    menu = new Menu();

    if(gameState == STATE.Game) {
        handler.addObject(new Player(100, 200, ID.Player, handler));
        handler.addObject(new Enemy(500,200, ID.Enemy, handler));
        this.addKeyListener(new KeyInput(handler));  
    }  
}
private void start() 
{
    isRunning = true;
    thread = new Thread(this);
    thread.start();

}
private void stop() 
{
    isRunning = false;
    try {
        thread.join();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}
public void run()
{
    this.requestFocus();
    long lastTime = System.nanoTime();
    double amountOfTicks = 60.0;
    double ns = 1000000000 / amountOfTicks;
    double delta = 0;
    long timer = System.currentTimeMillis();
    int frames = 0;
    while(isRunning) {
        long now = System.nanoTime();
        delta += (now - lastTime) / ns;
        lastTime = now;
        while(delta >= 1) {
            tick();
            delta--;
            }
        render();
        frames++;

        if(System.currentTimeMillis() - timer > 1000)
        {
            timer += 1000;
            frames = 0;
        }
    }
            stop();
}

private void tick()
{
    if(gameState == STATE.Game) {
    handler.tick();
    }else if(gameState == STATE.Menu ) {
        menu.tick();
    }
}
private void render()
{
    BufferStrategy bs = this.getBufferStrategy();
    if(bs==null) {
        this.createBufferStrategy(3);
        return;
    }
    Graphics g = bs.getDrawGraphics();

    //////////////////////////////////

    g.setColor(Color.red);
    g.fillRect(0, 0, 1000, 1000);

    if(gameState == STATE.Game) {

    g.setColor(Color.gray);
    g.fillRect(5,5,200,32);
    g.setColor(Color.green);
    g.fillRect(5,5,hp*2,32);
    g.setColor(Color.black);
    g.drawRect(5,5,200,32);

    g.setColor(Color.white);
    g.drawString("Ammo: " + ammo, 5,50);
    }else if(gameState == STATE.Menu) {
        menu.render(g); 

     /////////////////////////////////
    handler.render(g);

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


public static void main(String args[])
{
    new Window(800,600,"Red Ops",new Game());


}

}

菜单类

private Game game;
private Handler handler;
private Game menu;
public Menu(Game game, Handler handler) {
    this.game = game;
    this.handler = handler;
}

public void tick（）{

}

公共无效渲染（图形g）{

 ``if(game.gameState == STATE.Menu) {
 `` g.setColor(Color.RED);
 ` `g.drawRect(100,100,150,60);  
  }
}

}

我正在尝试从菜单类向游戏类调用render方法，但是不断出现定义菜单类的tick和render方法所需的错误。

先谢谢了：）