我想寫一個計時器類，每秒計數到0，但似乎計數太快了。我究竟做錯了什么？public class Eieruhr { private int x; public Eieruhr (int x){ this.x = x; } public static void main(String[] args){ Eieruhr eu = new Eieruhr(10); eu.start(); } public void start(){ for(int i = 0; i <= x; x--){ long s = System.nanoTime(); while( ((System.nanoTime() - s) / 100000000) < x); System.out.println("tick - " + x); } }}
1 回答
阿晨1998
TA貢獻2037條經驗 獲得超6個贊
我建議你使用TimeUnit.SECONDS.sleep(1). 看一下代碼：
public class Eieruhr {
private int x;
public Eieruhr(int x) {
this.x = x;
}
public static void main(String[] args) throws InterruptedException {
Eieruhr eu = new Eieruhr(10);
eu.start();
}
public void start() throws InterruptedException {
for (int i = 0; i < x; i++) {
TimeUnit.SECONDS.sleep(1);
System.out.println(new Date() + " tick - " + i);
}
}
}
輸出：
Sat Oct 19 15:11:37 EEST 2019 tick - 0
Sat Oct 19 15:11:38 EEST 2019 tick - 1
Sat Oct 19 15:11:39 EEST 2019 tick - 2
Sat Oct 19 15:11:40 EEST 2019 tick - 3
Sat Oct 19 15:11:41 EEST 2019 tick - 4
Sat Oct 19 15:11:42 EEST 2019 tick - 5
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