Java多線程實戰(zhàn)之交叉打印的兩種方法

更新時間：2019年02月11日 16:28:52 作者：邋遢的流浪劍客

今天小編就為大家分享一篇關于Java多線程實戰(zhàn)之交叉打印的兩種方法，小編覺得內(nèi)容挺不錯的，現(xiàn)在分享給大家，具有很好的參考價值，需要的朋友一起跟隨小編來看看吧

要求效果：先打印5次“printA…”，再打印5次“printB…”，每次打印間隔1秒，重復循環(huán)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();
 }
 }
}

總結

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