线程插队Join

public class test04 {

    public static void main(String[] args) throws InterruptedException {
        Q q = new Q();
        Thread thread = new Thread(q);
        for (int i = 0; i < 10; i++) {
            Thread.sleep(1000);
            System.out.println("hi");
            if (i == 4) {
                thread.start();
                thread.join();

            }

        }
        System.out.println("主线程结束");

    }

}


class Q implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            System.out.println("hellow");
        }
        System.out.println("子线程结束");
    }
}