在线程执行之间呼叫加入

Question

假设我有2个螺纹T1和T2执行可行。我在T1和T2中写了一些东西。在执行T2 3行后，T1应完成其执行，然后将T2完成执行。我可以用 Join()吗？

我开始编码某些内容，但不确定如何做。

public class JoinTest {
    static int count = 0;
    public static void main(String[] args) throws InterruptedException {

        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i =0; i< 10 ; i++) {
//                  System.out.println(i);
                    count++;
                }
            }
        });
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i =0; i< 10 ; i++) {
//                  System.out.println(i);
                    count++;
                }
            }
        });
        t1.start();
        t2.start();
        System.out.println(count);
    }
}

Answer 1

只需在T2的run()方法中调用t1.join()，就像：

public class JoinTest {
    static int count = 0;
    public static void main(String[] args) throws InterruptedException {

        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i =0; i< 10 ; i++) {
//                  System.out.println(i);
                    count++;
                }
            }
        });
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i =0; i< 10 ; i++) {
//                  System.out.println(i);
                    if (i == 2) {    //call t1.join() here, you can change this condition based on your logic
                       t1.join();
                    }
                    count++;                   
                }
            }
        });
        t1.start();
        t2.start();
        System.out.println(count);
    }
}
java multithreading