java – if(pause == null){不起作用

对于参数类型long,null,运算符==未定义

这是代码,

public class Timer extends CountDownTimer {
    long pause = (Long) null;

    public Timer(long startTime,long interval) {
        super(startTime,interval);
    }

    @Override
    public void onTick(long millisUntilFinished) {
        content.setText("Tijd over: " + millisUntilFinished / 100);
    }

    public void onPause(long millisUntilFinished) {
        if(pause == null) {
            pause = millisUntilFinished;
            content.setText("Tijd over: " + millisUntilFinished / 100);
            this.cancel();
        }
        else {
            this.start();   
        }
    }

    @Override
    public void onFinish() {
        content.setText("Tijd is op!");
    }
}

此类尚未完成,因此请忽略其余代码.