public class LockTest {
public static class ThreadTest implements Runnable {
private ReadWriteLock lock;
private Lock readLock;
private Lock writeLock;
private int arg0;
public void run() {
writeLock.lock();
try {
String name = Thread.currentThread().getName();
System.out.println(name + " start...");
long now = System.currentTimeMillis();
System.out.println(name + " start:" + now);
//System.out.println(10 / arg0);
try {
Thread.sleep(5000);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(10 / arg0);
long end = System.currentTimeMillis();
System.out.println(name + " end:" + end);
System.out.println(name + " use time:" + (end - now));
System.out.println(name + " end...");
} finally {
writeLock.unlock();
}
}
public ThreadTest(ReadWriteLock lock, int arg0) {
this.lock = lock;
this.readLock = lock.readLock();
this.writeLock = lock.writeLock();
this.arg0 = arg0;
}
}
public static void test01() {
ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
ThreadTest t1 = new ThreadTest(lock, 0);
ThreadTest t2 = new ThreadTest(lock, 1);
Thread thread1 = new Thread(t1, "th1");
Thread thread2 = new Thread(t2, "th2");
thread1.start();
thread2.start();
}
public static void main(String[] args) {
test01();
}
}
执行结果：
th1 start…
th1 start:1495075673822
th2 start…
[WARNING]
th2 start:1495075678827
java.lang.ArithmeticException: / by zero
at basic.simple.LockTest$ThreadTest.run(LockTest.java:38)
at java.lang.Thread.run(Thread.java:745)
10
th2 end:1495075683830
th2 use time:5003
th2 end…
结论：线程持锁状态下出现异常会释放锁。