private static volatile int i=0;
public static void main(String[] args) throws InterruptedException {
CountDownLatch countDownLatch=new CountDownLatch(2);
Lock lock=new ReentrantLock();
Thread thread1 = new Thread(new Runnable() {
@Override
public void run() {
try{
lock.lock();
i++;
}finally{
lock.unlock();
countDownLatch.countDown();
}
}
},"Thread-1");
Thread thread2 = new Thread(new Runnable() {
@Override
public void run() {
try{
lock.lock();
i++;
}finally{
lock.unlock();
countDownLatch.countDown();
}
}
},"Thread-2");
thread1.start();
thread2.start();
countDownLatch.await();
System.out.println(i);
}
private static volatile int i = 0;
public static void main(String[] args) throws InterruptedException {
CountDownLatch countDownLatch = new CountDownLatch(2);
Semaphore semaphore = new Semaphore(1);
Thread thread1 = new Thread(new Runnable() {
@Override
public void run() {
try {
semaphore.acquire();
} catch (InterruptedException e) {
e.printStackTrace();
}
i++;
semaphore.release();
countDownLatch.countDown();
}
}, "Thread-1");
Thread thread2 = new Thread(new Runnable() {
@Override
public void run() {
try {
semaphore.acquire();
} catch (InterruptedException e) {
e.printStackTrace();
}
i++;
semaphore.release();
countDownLatch.countDown();
}
}, "Thread-2");
thread1.start();
thread2.start();
countDownLatch.await();
System.out.println(i);
}