要求效果：先打印5次“printA…”，再打印5次“printB…”，每次打印间隔1秒，重复循环20次

方式一：使用wait()和notifyAll()方法

public class MyService { private volatile boolean flag = false; public synchronized void printA() { try { while (flag) { wait(); } for (int i = 0; i < 5; i++) { System.out.println("printA..."); TimeUnit.SECONDS.sleep(1); } flag = true; notifyAll(); } catch (InterruptedException e) { e.printStackTrace(); } } public synchronized void printB() { try { while (!flag) { wait(); } for (int i = 0; i < 5; i++) { System.out.println("printB..."); TimeUnit.SECONDS.sleep(1); } flag = false; notifyAll(); } catch (InterruptedException e) { e.printStackTrace(); } }}public class BackupA implements Runnable { private MyService myService; public BackupA(MyService myService) { super(); this.myService = myService; } @Override public void run() { myService.printA(); }}public class BackupB implements Runnable { private MyService myService; public BackupB(MyService myService) { super(); this.myService = myService; } @Override public void run() { myService.printB(); }}public class Run { public static void main(String[] args) { MyService myService = new MyService(); for (int i = 0; i < 20; i++) { new Thread(new BackupA(myService)).start(); new Thread(new BackupB(myService)).start(); } }}

方式二：使用await()和signalAll()方法

public class MyService { private Lock lock = new ReentrantLock(); private Condition condition = lock.newCondition(); private boolean flag = false; public void printA() { try { lock.lock(); while (flag) { condition.await(); } for (int i = 0; i < 5; i++) { System.out.println("printA..."); TimeUnit.SECONDS.sleep(1); } flag = true; condition.signalAll(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void printB() { try { lock.lock(); while (!flag) { condition.await(); } for (int i = 0; i < 5; i++) { System.out.println("printB..."); TimeUnit.SECONDS.sleep(1); } flag = false; condition.signalAll(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } }}public class ThreadA implements Runnable { private MyService myService; public ThreadA(MyService myService) { super(); this.myService = myService; } @Override public void run() { myService.printA(); }}public class ThreadB implements Runnable { private MyService myService; public ThreadB(MyService myService) { super(); this.myService = myService; } @Override public void run() { myService.printB(); }}public class Run { public static void main(String[] args) { MyService myService = new MyService(); for (int i = 0; i < 20; i++) { new Thread(new ThreadA(myService)).start(); new Thread(new ThreadB(myService)).start(); } }}

总结

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