方案1  使用Phaser

方案2  使用CyclicBarrier

package com.eyu.ahxy.module.common.config;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest4.MAX;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest4.NUM;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest4.phaser;

import java.util.concurrent.Phaser;

public class OneTwoOneTwoTest4 {

static int NUM = 0;

static int MAX = 6;

static Object LOCK = new Object();

static Phaser phaser = new Phaser(2);

public static void main(String[] args) throws InterruptedException {

Thread thread1 = new ThreadTest4();

thread1.start();

Thread thread2 = new ThreadTest4();

thread2.start();

thread1.join();

thread2.join();

}

}

class ThreadTest4 extends Thread {

public void run() {

while (true) {

synchronized (phaser) {

NUM = NUM + 1;

System.err.println(NUM + " ====" + Thread.currentThread());

if (NUM >= MAX) {

break;

}

}

phaser.arriveAndAwaitAdvance();

}

};

}

package com.eyu.ahxy.module.common.config;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest5.MAX;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest5.NUM;

import static com.eyu.ahxy.module.common.config.OneTwoOneTwoTest5.cyclicBarrier;

import java.util.concurrent.CyclicBarrier;

public class OneTwoOneTwoTest5 {

static int NUM = 0;

static int MAX = 6;

static CyclicBarrier cyclicBarrier;

public static void main(String[] args) throws InterruptedException {

cyclicBarrier = new CyclicBarrier(2);

Thread thread1 = new ThreadTest5();

thread1.start();

Thread thread2 = new ThreadTest5();

thread2.start();

thread1.join();

thread2.join();

}

}

class ThreadTest5 extends Thread {

public void run() {

while (true) {

synchronized (ThreadTest5.class) {

NUM = NUM + 1;

System.err.println(NUM + " ====" + Thread.currentThread());

if (NUM >= MAX) {

break;

}

}

try {

cyclicBarrier.await();

} catch (Exception e) {

e.printStackTrace();

}

}

};

}