package com.kuang.demo05;
public class TestJoin implements Runnable {@Overridepublic void run() {for (int i = 0; i <10 ; i++) {System.out.println("VIP线程来插队了！！！"+i);}}public static void main(String[] args) throws InterruptedException {
//        Thread thread= new Thread(new TestJoin());new Thread(new TestJoin()).start();for (int i = 0; i <400 ; i++) {System.out.println("主线程在排队！！！"+i);if (i==100){new Thread(new TestJoin()).join();}}}
}

没有按预期进行强制执行

1.原因每次强制执行都是新new（）了一个线程
2.在插队之前都是同步进行执行的
解决代码

package com.kuang.demo05;
public class TestJoin implements Runnable {@Overridepublic void run() {for (int i = 0; i <1000 ; i++) {System.out.println("VIP线程来插队了！！！"+i);}}public static void main(String[] args) throws InterruptedException {TestJoin testJoin = new TestJoin();Thread thread= new Thread(testJoin);thread.start();for (int i = 0; i <500 ; i++) {if (i==200){thread.join();}System.out.println("主线程在排队！！！"+i);}}
}```java
在这里插入代码片

![在这里插入图片描述](https://img-blog.csdnimg.cn/20201223124821993.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NzgzNjYw,size_16,color_FFFFFF,t_70)