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三个线程无限循环轮流执行按顺序打印123
实现思路：
三个线程基于不同的Condition完成等待和继续
最简单的实现(不考虑任何封装)：
public class Solution {public static void main(String[] args) throws InterruptedException {ReentrantLock lock = new ReentrantLock();Condition condition1 = lock.newCondition();Condition condition2 = lock.newCondition();Condition condition3 = lock.newCondition();new Thread(new Runnable() {@Overridepublic void run() {while (true) {System.out.println("1");try {lock.lock();condition2.signal();condition1.await();} catch (InterruptedException e) {throw new RuntimeException(e);} finally {lock.unlock();}}}}).start();//线程start之后不一定立即run起来-这里测试用的代码-用来先后启动目标线程Thread.sleep(100);new Thread(new Runnable() {@Overridepublic void run() {while (true) {System.out.println("2");try {lock.lock();condition3.signal();condition2.await();} catch (InterruptedException e) {throw new RuntimeException(e);} finally {lock.unlock();}}}}).start();//线程start之后不一定立即run起来-这里测试用的代码-用来先后启动目标线程Thread.sleep(100);new Thread(new Runnable() {@Overridepublic void run() {while (true) {System.out.println("3");try {lock.lock();condition1.signal();condition3.await();} catch (InterruptedException e) {throw new RuntimeException(e);} finally {lock.unlock();}}}}).start();}}
简单封装一下
public class Solution {private static class PrintRunnable implements Runnable {private final String value;private final Lock lock;private final Condition cur, next;public PrintRunnable(String value, Lock lock, Condition cur, Condition next) {this.value = value;this.lock = lock;this.cur = cur;this.next = next;}@Overridepublic void run() {while (true) {System.out.println(value);try {lock.lock();//这里next.signal();//这里特别注意：await会阻塞线程-因此要在这之前触发signalcur.await();} catch (InterruptedException e) {throw new RuntimeException(e);} finally {lock.unlock();}}}}public static void main(String[] args) throws InterruptedException {ReentrantLock lock = new ReentrantLock();Condition condition1 = lock.newCondition();Condition condition2 = lock.newCondition();Condition condition3 = lock.newCondition();new Thread(new PrintRunnable("1", lock, condition1, condition2)).start();Thread.sleep(100);new Thread(new PrintRunnable("2", lock, condition2, condition3)).start();Thread.sleep(100);new Thread(new PrintRunnable("3", lock, condition3, condition1)).start();}}
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