本文主要是介绍java可重入锁示例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
package Thread2;/*** 可重入锁示例*/
public class ReenTranLockDemo {private Object currentThread;private int lockTimes = 0;public synchronized void lock() throws InterruptedException {while (Thread.currentThread() == currentThread || currentThread == null || lockTimes > 0) {if (Thread.currentThread() == currentThread) {//当前线程重复加锁lockTimes++;System.out.println(1);System.out.println(currentThread);return;} else if (currentThread == null) {//当前线程首次加锁currentThread = Thread.currentThread();lockTimes++;System.out.println(2);System.out.println(currentThread);return;} else {//锁已被占用，当前线程进入等待wait();System.out.println(3);System.out.println(currentThread);}}System.out.println("lockTime:" + lockTimes);return;}public synchronized void unlock() {if (currentThread != null && Thread.currentThread() == currentThread) {if (1 == lockTimes) {currentThread = null;notify();System.out.println(4);System.out.println(currentThread);} else {System.out.println(5);System.out.println(currentThread);}lockTimes--;}System.out.println("lockTime:" + lockTimes);}}
package Thread2;public class RunReenTranLock {private static int a =0;public static void main(String[] args) throws InterruptedException {ReenTranLockDemo reenTranLockDemo = new ReenTranLockDemo();Thread thread = new Thread(new Runnable() {@Overridepublic void run() {try {reenTranLockDemo.lock();try {reenTranLockDemo.lock();for (int i = 0; i < 10000; i++) {a++;}} catch (InterruptedException e) {e.printStackTrace();} finally {reenTranLockDemo.unlock();}} catch (InterruptedException e) {e.printStackTrace();} finally {reenTranLockDemo.unlock();}}});Thread thread1 = new Thread(new Runnable() {@Overridepublic void run() {try {reenTranLockDemo.lock();try {reenTranLockDemo.lock();for (int i = 0; i < 10000; i++) {a++;}} catch (InterruptedException e) {e.printStackTrace();} finally {reenTranLockDemo.unlock();}} catch (InterruptedException e) {e.printStackTrace();} finally {reenTranLockDemo.unlock();}}});thread.start();thread1.start();thread.join();thread1.join();System.out.println(a);}
}
测试结果
2
Thread[Thread-0,5,main]
1
Thread[Thread-0,5,main]
5
Thread[Thread-0,5,main]
lockTime:1
4
null
lockTime:0
3
null
2
Thread[Thread-1,5,main]
1
Thread[Thread-1,5,main]
5
Thread[Thread-1,5,main]
lockTime:1
4
null
lockTime:0
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