ReentrantLock可重入性

package com.wkcto.lock.reentrant;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 *  ReentrantLock鎖的可重入性
 */
public class Test04 {
    static class Subthread extends Thread{
        private static Lock lock = new ReentrantLock();        //定義鎖對象
        public static int num = 0;      //定義變量
        @Override
        public void run() {
            for (int i = 0; i <10000 ; i++) {
                try {
                    //可重入鎖指可以反復獲得該鎖
                    lock.lock();
                    lock.lock();
                    num++;
                }finally {
                    lock.unlock();
                    lock.unlock();
                }
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        Subthread t1 = new Subthread();
        Subthread t2 = new Subthread();
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println( Subthread.num );
    }
}