java多執行緒 CountDownLatch減法計數器
import java.util.concurrent.CountDownLatch;
public class CountDownLatchDemo {
public static void main(String[] args) {
CountDownLatch countDownLatch = new CountDownLatch(6);
for (int i = 1; i <= 6; i++) {
new Thread(() -> {
System.out.println(Thread.currentThread().getName() + " Go out");
countDownLatch.countDown();// 數量 -1
}, String.valueOf(i)).start();
}
try {
countDownLatch.await();// 等等計數器歸零，然后程式向下執行
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("close door");
}
}
運行結果
3 Go out
6 Go out
5 Go out
4 Go out
1 Go out
2 Go out
close door
特別鳴謝：狂神說Java
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