写在前面
来个大佬看看我的解决办法对不对。。。啊啊啊！！！
求评论！！！求解答！！！
（1）解决办法是否正确？
（2）如果错误，具体原因是什么？CountDownLatch使用的是否有问题？
线程不安全的场景
public class CASTest1 {
int i = 0;
public static void main(String[] args) throws InterruptedException {
CountDownLatch countDownLatch = new CountDownLatch(2);
CASTest1 casTest = new CASTest1();
new Thread(() -> {
for (int j = 0; j < 100; j++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
casTest.i++;
}
}).start();
new Thread(() -> {
for (int j = 0; j < 100; j++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
casTest.i++;
}
}).start();
//Thread.sleep(3000);
System.out.println(casTest.i);
}
}
解决办法
public class CASTest3 {
AtomicInteger i = new AtomicInteger();
//int i = 0;
public static void main(String[] args) throws InterruptedException {
CountDownLatch countDownLatch = new CountDownLatch(2);
CASTest3 casTest = new CASTest3();
new Thread(() -> {
for (int j = 0; j < 100; j++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
//casTest.i++;
casTest.i.getAndIncrement();
}
countDownLatch.countDown();
}).start();
new Thread(() -> {
for (int j = 0; j < 100; j++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
//casTest.i++;
casTest.i.getAndIncrement();
}
countDownLatch.countDown();
}).start();
//Thread.sleep(900);
countDownLatch.await();
System.out.println(casTest.i.get());
}
}
