在屏幕上显示FPS？ Java的

Question

我是开发游戏的新手。我有这段代码：

private void render() //renders graphics
{
    BufferStrategy bs = this.getBufferStrategy();
    if(bs == null)
    {
        this.createBufferStrategy(3);
        return;
    }
    Graphics g = bs.getDrawGraphics();

    g.setColor(Color.BLACK);
    g.fillRect(0, 0,WIDTH, HEIGHT);

    g.setFont(new Font("Dialog", Font.BOLD, 18)); //doesnt work
    g.drawString(Color.BLUE + "FPS: " + Color.ORANGE + frames, 50, 50);

    handler.render(g);
    hud.render(g);

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

我有一个问题......应该显示fps的g.drawString没有显示fps ...我错了什么？这是在java btw ...