多线程|Java三线程按序打印10次ABC (Lock实现与synchronized,wait,notify实现) 多线程|Java学习笔记

三线程循环打印ABC
【多线程|Java三线程按序打印10次ABC (Lock实现与synchronized,wait,notify实现)】方法一：使用Lock

import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class Test {static private int cnt = 0; static Lock lk = new ReentrantLock(); public static void main(String[] args) throws InterruptedException { Thread A = new Thread(new Runnable() { @Override public void run() { while(cnt <= 30) { lk.lock(); if (cnt % 3 == 0) { System.out.print("A "); cnt++; } lk.unlock(); } } }); Thread B = new Thread(new Runnable() { @Override public void run() { while(cnt <= 30) { lk.lock(); if (cnt % 3 == 1) { System.out.print("B "); cnt++; } lk.unlock(); } } }); Thread C = new Thread(new Runnable() { @Override public void run() { while(cnt <= 30) { lk.lock(); if (cnt % 3 == 2) { System.out.print("C\n"); cnt++; } lk.unlock(); } } }); A.start(); B.start(); C.start(); } }

方法二：synchronized，wait，noify实现

import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class Test {public static void main(String[] args) throws InterruptedException { Object A = new Object(); Object B = new Object(); Object C = new Object(); Thread At = new Thread(new Print(A, B), "A"); Thread Bt = new Thread(new Print(B, C), "B"); Thread Ct = new Thread(new Print(C, A), "C"); At.sleep(100); At.start(); Bt.sleep(100); Bt.start(); Ct.sleep(100); Ct.start(); } }class Print implements Runnable {Object nxt, cur; public Print(Object cur, Object nxt) { this.cur = cur; this.nxt = nxt; } @Override public void run() { for(int i = 0; i < 10; i++) { synchronized (cur) { synchronized (nxt) { System.out.print(Thread.currentThread().getName()); nxt.notify(); } try { cur.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } } }