[Java知识库]利用条件变量和lock锁实现顺序输出ABC

package com.njupt.charapter07;

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

/**
 * Creat with IntelliJ IDEA
 *
 * @Auther:倔强的加瓦
 * @Date:2022/04/05/15:25
 * @Description:
 */
public class ABC {
    private int times;
    private int count=0;
    private Lock lock = new ReentrantLock();
    private Condition ca = lock.newCondition();
    private Condition cb = lock.newCondition();
    private Condition cc = lock.newCondition();

    public ABC(int times){
        this.times=times;
    }
    public void print(int target , Condition cur,Condition next){
        for(int i=0;i<times;i++){
            try {
                lock.lock();
                while(count%3!=target){
                    cur.await();
                }
                //此时符合条件了，需要输出
                System.out.println(Thread.currentThread().getName());
                count++;
                next.signal();
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }
    }
    public void printA(){
        print(0,ca,cb);
    }
    public void printB(){
        print(1,cb,cc);
    }
    public void printC(){
        print(2,cc,ca);
    }
    public static void main(String[] args) {
        ABC abc = new ABC(10);
        new Thread(()->{
            abc.printA();
        },"A").start();
        new Thread(()->{
            abc.printB();
        },"B").start();
        new Thread(()->{
            abc.printC();
        },"C").start();
    }


}