java AtomicInteger似乎不适合我
我正在尝试为我的Libgdx
游戏创建一个简单的10秒倒计时计时器。我已经创建了一个timekeep类,它实现了runnable,并且可以很好地进行10秒倒计时。然而,我想打印这个Timer
变量,因为它在我的主游戏杯中发生了变化,但由于某些原因,我无法这样做。我一直收到一个空指针异常。我想这可能是一个同步错误,因为Render在它自己的线程中运行,而我的timekeep运行它自己的线程。我尝试过volatile变量和同步gettime方法,现在尝试了原子整数,但没有成功。如何从我的timekeep类获取Timer
变量,并在更新时从我的主游戏类打印它?谢谢
这是我的计时课
public class timekeep implements Runnable {
public volatile Boolean TimerRunning = true;
//private int Timer = 10;//I want to print this variable as it counts down
public AtomicInteger Timer = new AtomicInteger(10);
public int Timeleft;
@Override
public void run() {
while (TimerRunning == true) {
System.out.println("Time left" + Timer);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (Timer.equals(0)) {
TimerRunning = false;
} else {
Timer.decrementAndGet();
}
}
}
public int getTimer() {
return Timer.get();
}
}
其他主要游戏屏幕类 计时
//constructor
Timekeep = new timekeep();
//on show create the thread
timekeep Timekeep = new timekeep();//inside show method in main game screen class
Thread t1 = new Thread(Timekeep);
t1.start();
//inside the render method
System.out.println(Timekeep.getTimer());//inside render method in main game screenclass
# 1 楼答案
改变现状
到
AtomicInteger不重写equals方法。传递的是原语int 0,它将不等于对象AtomicInteger。获取int值并与0进行比较