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示例demo：

mport java.util.concurrent.CountDownLatch;import java.util.concurrent.TimeUnit;import java.util.stream.IntStream;public class Demo {
       static CountDownLatch countDownLatch = new CountDownLatch(6);    static class Parent {
           static {
               try {
                   System.out.println(System.currentTimeMillis() + "---Parent类被初始化");                TimeUnit.SECONDS.sleep(6);            } catch (InterruptedException e) {
                   e.printStackTrace();            }        }    }    public static void main(String[] args) throws InterruptedException {
           for (int i = 0; i < 6; i++) {
               new Thread(() -> {
                   new Parent();                countDownLatch.countDown();            }).start();        }        countDownLatch.await();        System.out.println("main函数结束");    }}

运行结果：

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