一段代码说明锁的作用
public class Test {
private static int a;
private static int b;
private static int c;
static Lock lock = new ReentrantLock();
private synchronized static void incrOfa() {
a++;
}
private static void incrOfb() {
b++;
}
private static void incrOfc() {
lock.lock();
c++;
lock.unlock();
}
public static void main(String[] args) {
ExecutorService executor = Executors.newCachedThreadPool();
CountDownLatch downLatch = new CountDownLatch(10000);
for (int i = 0; i < 10000; i++) {
executor.execute(() ->{
incrOfa();
incrOfb();
incrOfc();
downLatch.countDown();
});
}
try {
downLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
executor.shutdown();
System.out.println("synchronized锁："+a);
System.out.println("无锁："+b);
System.out.println("lock锁 ："+c);
}
}
synchronized锁：10000
无锁：9994
lock锁 ：10000
