Java多线程实战之交叉打印的两种方法

Java多线程实战之交叉打印的两种方法

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) {

MySJUIyZzervice 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(MySerJUIyZzvice 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();

}

}

}

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