三个线程顺序打印ABC多次算法

三个线程顺序打印ABC五次：

package com.jintao.example.lock.orderprintstr; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.ReentrantLock; /** * @author jinjueYang * @description 顺序打印五次ABC * @date 2019/11/18 9:02 */ public class OrderPrintStr {public static void main(String[] args) throws InterruptedException { ReentrantLock reentrantLock = new ReentrantLock(); Condition conditionA = reentrantLock.newCondition(); Condition conditionB = reentrantLock.newCondition(); Condition conditionC = reentrantLock.newCondition(); new Thread(new PrintTask(reentrantLock, conditionA, conditionB, "A")).start(); Thread.sleep(100); new Thread(new PrintTask(reentrantLock, conditionB, conditionC, "B")).start(); Thread.sleep(100); new Thread(new PrintTask(reentrantLock, conditionC, conditionA, "C")).start(); }static class PrintTask implements Runnable { //打印次数 private static final int PRINT_COUNT = 5; private ReentrantLock reentrantLock; private Condition condition; private Condition nextCondition; private String printStr; public PrintTask(ReentrantLock reentrantLock, Condition condition, Condition nextCondition, String printStr) { this.reentrantLock = reentrantLock; this.condition = condition; this.nextCondition = nextCondition; this.printStr = printStr; } @Override public void run() { reentrantLock.lock(); try { for (int i = 0; i < PRINT_COUNT; i++) { System.out.print(printStr); //唤醒下一个线程打印 this.nextCondition.signal(); if (i < PRINT_COUNT - 1) { //最后一次打印，无需等待，不然后续没有唤醒会死锁在这里 try { this.condition.await(); } catch (InterruptedException e) { e.printStackTrace(); } } } } finally { reentrantLock.unlock(); } } } }

运行结果：