java | 设计模式 同步模式 交替输出 park & unpark

park & unpark 的交替输出。

package com.redisc;

import lombok.extern.slf4j.Slf4j;

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

@Slf4j(topic = "c.Run")
public class Run {

static Thread t1;
    static Thread t2;
    static Thread t3;

public static void main(String[] args) throws Exception {
        ParkUnpark pu = new ParkUnpark(5);
        t1 = new Thread(() -> {
            pu.print("a", t2);
        });
        t2 = new Thread(() -> {
            pu.print("b", t3);
        });
        t3 = new Thread(() -> {
            pu.print("c", t1);
        });

t1.start();
        t2.start();
        t3.start();

LockSupport.unpark(t1);
    }

}

class ParkUnpark {
    private int loopNumber;

public ParkUnpark(int loopNumber) {
        this.loopNumber = loopNumber;
    }

// 参数 1 打印内容 参数2 进入哪一间休息室 参数 3 下一间休息室
    public void print(String str, Thread next) {
        for (int i = 0; i < loopNumber; i++) {
            LockSupport.park();
            System.out.println(str);
            LockSupport.unpark(next);
        }
    }
}