原子int

AtomicInteger 执行计算时，原子递增，可以不用锁，就能实现同步。^_^
public class MyTest {

private AtomicInteger    a =new AtomicInteger(0);

//ReentrantLock reentrantLock = new ReentrantLock();

    public void increment() {

//reentrantLock.lock();

        while (a.intValue() <10) {

int aValue =a.incrementAndGet();

System.out.println(Thread.currentThread().getName() +" a : " + aValue);

try {

Thread.sleep(1000);

}catch (InterruptedException e) {

e.printStackTrace();

}

}

//reentrantLock.unlock();

    }

public static void main(String[] args) {

MyTest myTest =new MyTest();

Thread t1 =new Thread(new Runnable() {

@Override

            public void run() {

myTest.increment();

}

},"t1");

Thread t2 =new Thread(new Runnable() {

@Override

            public void run() {

myTest.increment();

}

},"t2");

t1.start();

t2.start();

}

}