JUC（2）使用condition实现精准通知唤醒

JUC（2）使用condition实现精准通知唤醒

package com.orderPC;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** * 执行A，然后B，然后C，然后A */public class ProductC { public static void main(String[] args) { Data3 data3 = new Data3(); new Thread(()->{ for (int i = 0; i <5 ; i++) { data3.printA(); } },"A").start(); new Thread(()->{ for (int i = 0; i < 5; i++) { data3.printB(); } },"B").start(); new Thread(()->{ for (int i = 0; i < 5; i++) { data3.printC(); } },"C").start(); }}//资源类class Data3{ private Lock lock = new ReentrantLock(); Condition condition1 = lock.newCondition(); Condition condition2 = lock.newCondition(); Condition condition3 = lock.newCondition(); private int num = 1; public void printA(){ lock.lock(); try { while(num != 1){ //等待 condition1.await(); } System.out.println(Thread.currentThread().getName()+"-->AAA"); num=2; //唤醒，唤醒指定的 condition2.signal(); } catch (Exception e) { e.printStackTrace(); } finally { lock.unlock(); } } public void printB(){ lock.lock(); try { while(num !=2 ){ condition2.await(); } System.out.println(Thread.currentThread().getName()+"-->BBB"); num =3; //唤醒指定线程 condition3.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void printC(){ lock.lock(); try { while(num != 3){ //等待 condition3.await(); } System.out.println(Thread.currentThread().getName()+"-->CCC"); num = 1; condition1.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } }}

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