java - 为什么 FPS 不打印在我的窗口中？

Question

我相信 FPS一旦我启动这个程序，就会在我的新窗口中的某个地方打印。我看到该窗口，但其中未显示 FPS。怎么了？

public class Game extends Canvas implements Runnable {
  private static final long serialVersionUID = 1L;

  public static final int WIDTH = 640, HEIGHT = WIDTH / 12 * 9;
  private Thread thread;
  private boolean running = false;

  public Game() {
    new Window(WIDTH, HEIGHT, "MY GAME", this);
  }

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

  public synchronized void stop() {
    try {
      thread.join();
      running = false;
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void run() {
    long lastTime = System.nanoTime();
    double amountOfTicks = 60.0;
    double ns = 1000000000 / amountOfTicks;
    double delta = 0;
    long timer = System.currentTimeMillis();
    int frames = 0;
    while (running) {
      long now = System.nanoTime();
      delta += (now - lastTime) / ns;
      lastTime = now;
      while (delta <= 1) {
        delta--;
      }
      if (running)
        frames++;

      if (System.currentTimeMillis() - timer > 1000) {
        timer += 1000;
        System.out.println("fps: " + frames);
        frames = 0;
      }
    }
    stop();
  }

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

Answer 1

本教程可能意味着 fps 将被打印到也在作者的开发环境中打开的某个控制台窗口中。 System.out.println 仍将打印到标准输出，除非您使用 setOut 更改它。并编写一些附加代码，然后将文本放入或绘制 Window 中 GUI 组件中的文本。