多线程Thread join()

Thread 类join方法，保证子线程执行完成后，再执行父线程，在start 后执行join有效

public class MainTest {
    @Test
    public void test4() throws InterruptedException {
        Thread t1 = new Thread(new Conn(), "t1")/*{//匿名内部类优先执行
            @Override
            public void run(){
                System.out.println(Thread.currentThread().getName());
            }
        }*/;
        t1.start();
        t1.join();
        System.out.println(Thread.currentThread().getName());

    }
}
class Conn implements Runnable {

    @Override
    public void run() {
　　　　　　//流range
        IntStream.range(0, 1000).forEach(i -> {
            System.out.println(Thread.currentThread().getName() + i);
            try {
                Thread.sleep(1_000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }/*System.out::println //lambda 方法引用*/);
    }
}