线程间定制化通信（ReentrantLock）

启动三个线程

*AA打印5次，BB打印10次，CC打印15次        进行10轮

package juc.two;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

//第一步 创建资源类
class ShareResource {
    //定义标志位
    private int flag = 1;   // 1 AA     2 BB        3 CC
    //创建Lock锁
    private Lock lock = new ReentrantLock();

    //创建三个condition
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    //打印5次，参数第几轮
    public void print5(int loop) throws InterruptedException {
        //上锁
        lock.lock();
        try {
            //判断
            while (flag != 1){
                //等待
                c1.await();
            }
            //干活
            for (int i = 1; i <=5;i++){
                System.out.println(Thread.currentThread().getName()+" :: "+i+" :轮数:"+loop);
            }
            //通知
            flag = 2;//修改标志位 2
            c2.signal();//通知BB线程
        }finally {
            //释放锁
            lock.unlock();
        }
    }

    //打印10参数第几轮
    public void print10(int loop) throws InterruptedException {
        lock.lock();
        try {
            while (flag != 2){
                c2.await();
            }
            for (int i = 1; i <=10;i++){
                System.out.println(Thread.currentThread().getName()+" :: "+i+" :轮数:"+loop);
            }
            //修改标志位
            flag = 3;
            //通知CC线程
            c3.signal();
        }finally {
            lock.unlock();
        }
    }

    //打印15参数第几轮
    public void print15(int loop) throws InterruptedException {
        lock.lock();
        try {
            while (flag != 3){
                c3.await();
            }
            for (int i = 1; i <=15;i++){
                System.out.println(Thread.currentThread().getName()+" :: "+i+" :轮数:"+loop);
            }
            //修改标志位
            flag = 1;
            //通知AA线程
            c1.signal();
        }finally {
            lock.unlock();
        }
    }
}

public class ThreadDemo3 {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(()->{
            for(int i = 1;i <=10; i++){
                try {
                    shareResource.print5(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"AA").start();

        new Thread(()->{
            for(int i = 1;i <=10; i++){
                try {
                    shareResource.print10(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"BB").start();

        new Thread(()->{
            for(int i = 1;i <=10; i++){
                try {
                    shareResource.print15(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"CC").start();
    }
}