有必要在JPanel上调用setDoubleBuffered吗?

Java教程说在许多组件中默认启用了双缓冲。

Swing在它的许多组件中使用这种技术,通常在默认情况下使用setDoubleBuffered方法启用。

这个 isDoubleBuffered 对于一个 JPanel 那么打电话是多余的吗 setDoubleBuffered(true) 在一个棋盘是 ? (需要减少闪烁和更平滑的动画。)

isFocusable 返回true,但我们需要调用 setFocusable

编辑

private void initBoard() {
    ...
    setDoubleBuffered(true); // Is it necessary?

    // isFocusable returns true, but when setFocusable is not called
    // key events are not processed
    setFocusable(true); 

    addKeyListener(new TAdapter());

    exec = Executors.newSingleThreadScheduledExecutor();
    exec.scheduleAtFixedRate(() -> {
        doGameCycle();       
    }, INITIAL_DELAY, PERIOD, TimeUnit.MILLISECONDS);
   ...
}

private void doGameCycle() {

    updateBalloons();
    repaint();
}

@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);

    if (isRunning) {
        doDrawing(g);
    } else {
        gameOver(g);
    }

    Toolkit.getDefaultToolkit().sync();
}  

private class TAdapter extends KeyAdapter {

    @Override
    public void keyPressed(KeyEvent e) {
        ...
        System.out.println("key pressed");
        ...
    }
}