/*
* 題目：多線程之間按順序調用，實現A->B->C三個線程啟動，要求如下：
* A打印5次，B打印10次，C打印15次
* 緊接著
* A打印5次，B打印10次，C打印15次
* 。。。。。
* 打印10輪
* */

SyncAndReentrantLockDemo.java

import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock;class ShareResource{private int number = 1;//A:1.B:2,C:3private Lock lock = new ReentrantLock();private Condition c1 = lock.newCondition();private Condition c2 = lock.newCondition();private Condition c3 = lock.newCondition();public void print5(){lock.lock();try{//1判斷while(number != 1){c1.await();}//2干活for(int i=1;i<=5;i++){System.out.println(Thread.currentThread().getName()+"\t"+i);}//3通知number = 2;c2.signal();}catch (Exception e){e.printStackTrace();}finally {lock.unlock();}}public void print10(){lock.lock();try{//1判斷while(number != 2){c2.await();}//2干活for(int i=1;i<=10;i++){System.out.println(Thread.currentThread().getName()+"\t"+i);}//3通知number = 3;c3.signal();}catch (Exception e){e.printStackTrace();}finally {lock.unlock();}}public void print15(){lock.lock();try{//1判斷while(number != 3){c3.await();}//2干活for(int i=1;i<=15;i++){System.out.println(Thread.currentThread().getName()+"\t"+i);}//3通知number = 1;c1.signal();}catch (Exception e){e.printStackTrace();}finally {lock.unlock();}}}public class SyncAndReentrantLockDemo {public static void main(String[] args){ShareResource shareResource = new ShareResource();new Thread(()->{for(int i=1;i<=10;i++){shareResource.print5();}},"A").start();new Thread(()->{for(int i=1;i<=10;i++){shareResource.print10();}},"B").start();new Thread(()->{for(int i=1;i<=10;i++){shareResource.print15();}},"C").start();} }

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