CountDownLatch
让一些线程阻塞直到另一些线程完成一系列操作后才被唤醒
package com.brian.interview.study.thread;
import com.brian.interview.enums.CountryEnum;
import java.util.concurrent.CountDownLatch;
/**
* Copyright (c) 2020 ZJU All Rights Reserved
* <p>
* Project: JavaSomeDemo
* Package: com.brian.interview.study.thread
* Version: 1.0
* <p>
* Created by Brian on 2020/2/12 14:22
*/
public class CountDownLatchDemo {
public static void main(String[] args) throws InterruptedException {
CountDownLatch countDownLatch = new CountDownLatch(6);
for (int i = 1; i <= 6; i++) {
new Thread(() -> {
System.out.println(Thread.currentThread().getName() + "\t 国, 被灭");
countDownLatch.countDown();
}, CountryEnum.forEach_CountryEnum(i).getRetMessage()).start();
}
countDownLatch.await();
System.out.println(Thread.currentThread().getName() + "\t *************秦帝国, 一统华夏");
System.out.println();
System.out.println(CountryEnum.ONE);
System.out.println(CountryEnum.ONE.getRetCode());
System.out.println(CountryEnum.ONE.getRetMessage());
}
private static void closeDoor() throws InterruptedException {
CountDownLatch countDownLatch = new CountDownLatch(6);
for (int i = 1; i <= 6; i++) {
new Thread(() -> {
System.out.println(Thread.currentThread().getName() + "\t 上完自习, 离开教室");
countDownLatch.countDown();
}, String.valueOf(i)).start();
}
countDownLatch.await();
System.out.println(Thread.currentThread().getName() + "\t *************班长最后关门走人");
}
}
CyclicBarrier
集齐7颗龙珠就能召唤神龙
package com.brian.interview.study.thread;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
/**
* Copyright (c) 2020 ZJU All Rights Reserved
* <p>
* Project: JavaSomeDemo
* Package: com.brian.interview.study.thread
* Version: 1.0
* <p>
* Created by Brian on 2020/2/12 18:06
*/
public class CyclicBarrierDemo {
public static void main(String[] args) {
// CyclicBarrier(int parties, Runnable barrierAction)
CyclicBarrier cyclicBarrier = new CyclicBarrier(7, () -> {System.out.println("*******召唤神龙");});
for (int i = 1; i <= 7; i++) {
final int tempInt = i;
new Thread(() -> {
System.out.println(Thread.currentThread().getName() + "\t 收集到第:" + tempInt + "龙珠");
try {
cyclicBarrier.await();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}, String.valueOf(i)).start();
}
}
}
Semaphore
信号量主要用于两个目的,一个是用于多个共享资源的互斥使用,另一个用于并发线程数的控制。
package com.brian.interview.study.thread;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
/**
* Copyright (c) 2020 ZJU All Rights Reserved
* <p>
* Project: JavaSomeDemo
* Package: com.brian.interview.study.thread
* Version: 1.0
* <p>
* Created by Brian on 2020/2/12 18:25
*/
public class SemaphoreDemo {
public static void main(String[] args) {
Semaphore semaphore = new Semaphore(3); // 模拟3个停车位
for (int i = 1; i <= 6; i++) { // 模拟6部汽车
new Thread(() -> {
try {
semaphore.acquire();
System.out.println(Thread.currentThread().getName() + "\t抢到车位");
try {
TimeUnit.SECONDS.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "\t停车3秒后离开车位");
semaphore.release();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
}
}, String.valueOf(i)).start();
}
}
}