java sleep try_java 线程内部使用sleep导致主程序退出。

三线程顺序输出从1-100

一个主类，函数内部创建三个线程。

相关代码

package concurrent.order.threeThread;

import org.apache.log4j.Logger;

import org.junit.jupiter.api.Test;

import java.util.concurrent.atomic.AtomicInteger;

import java.util.concurrent.locks.Condition;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

public class Main {

private static Logger log = Logger.getLogger(Main.class);

@Test

void main() {

final Three[] flag = {Three.ONE};

Lock lock = new ReentrantLock();

final Condition oneCondition = lock.newCondition();

final Condition twoCondition = lock.newCondition();

final Condition threeCondition = lock.newCondition();

AtomicInteger integer = new AtomicInteger();

integer.getAndIncrement();

Thread thread1 = new Thread(() -> {

for (; integer.get() < 100; ) {

lock.lock();

while (flag[0] != Three.ONE) {

try {

oneCondition.await();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

log.info(integer.getAndIncrement());

flag[0] = Three.TWO;

twoCondition.signal();

lock.unlock();

}

});

Thread thread2 = new Thread(() -> {

for (; integer.get() < 100; ) {

lock.lock();

while (flag[0] != Three.TWO) {

try {

twoCondition.await();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

log.info(integer.getAndIncrement());

flag[0] = Three.THREE;

threeCondition.signal();

lock.unlock();

}

});

Thread thread3 = new Thread(() -> {

for (; integer.get() < 100; ) {

lock.lock();

while (flag[0] != Three.THREE) {

try {

threeCondition.await();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

log.info(integer.getAndIncrement());

flag[0] = Three.ONE;

oneCondition.signal();

lock.unlock();

}

});

thread1.start();

thread2.start();

thread3.start();

}

}

package concurrent.order.threeThread;

public enum Three {

ONE, TWO, THREE

}

结果是正确输出的，但是我想在每个log输出后sleep一段时间

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

但是问题出现了，只是执行了一次thread1 程序即退出了。

请教各位大神，这个是怎么回事呢?