Java读写锁代码实现

读写锁的代码实现。使用到了juc下的一个接口，ReentrantReadWriteLock。可重入的读写锁。

package deadlock;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * @author leon
 * @描述
 */


class MyCache {
    private volatile Map<String, Object> map = new HashMap<>();
    private ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();

    public void  put(String key, Object value) {
        rwLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t 正在写入" + key);
            try {
                TimeUnit.MILLISECONDS.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            map.put(key,value);
            System.out.println(Thread.currentThread().getName() + "写入完成");
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            rwLock.writeLock().unlock();
        }


    }
    public void  get (String key){
        rwLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t 正在读取");
            try {
                TimeUnit.MILLISECONDS.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName() + "读取完成" + result);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            rwLock.readLock().unlock();
        }


    }
}



public class ReadWriteLockDemo {
    public static void main(String[] args) {
        MyCache myCache = new MyCache();
        for (int i = 1; i <= 5; i++)
        {
            final int tempInt = i;
            new Thread(() -> {
                myCache.put(tempInt + "", tempInt + "");
            },String.valueOf(i)).start();
        }

        for (int i = 1; i <= 5; i++)
        {
            final int tempInt = i;
            new Thread(() -> {
                myCache.get(tempInt + "");
            },String.valueOf(i)).start();
        }
    }
}