java CountDownLatch与golang WaitGroup的用法

主线程等待所有线程执行结束再继续执行

public class TestCountDownLatch {

    static int loopCount = 10;
    static CountDownLatch latch = new CountDownLatch(loopCount);

    static class Hello implements Runnable{

        private int i;

        private Hello(int i){
            this.i = i;
        }

        @Override
        public void run() {
            System.out.println("hello i = "+i);
            latch.countDown();
        }
    }

    public static void main(String[] args) throws Exception {
        for(int i = 0; i < loopCount; i++){
            new Thread(new Hello(i)).start();
        }
        latch.await();
        System.out.println("main finish");
    }
}

var wg sync.WaitGroup

func hello(i int) {
	defer wg.Done()
	fmt.Println("hello i = ", i)
}

func main() {
	loopCount := 10
	wg.Add(loopCount)
	for i := 0; i < loopCount; i++ {
		go hello(i)
	}
	wg.Wait()
	fmt.Println("main finish")
}

本文地址：https://blog.csdn.net/lovecj111/article/details/110290098