认识达内从这里开始

昆明IT培训的小编知道，ReadWriteLock维护了一对锁，读锁可允许多个读线程并发使用，写锁是独占的。

下面通过一个简单的例子来了解ReadWriteLock。

1 package com.ccfdod.juc;

2

3 import java.util.concurrent.locks.ReadWriteLock;

4 import java.util.concurrent.locks.ReentrantReadWriteLock;

5

6 /**

7 *写写/读写，需要互斥

8 *读读，不需要互斥

9 */

10 public class TestReadWriteLock {

11

12    public static void main(String[] args) {

13        ReadWriteLockDemo rw = new ReadWriteLockDemo();

14        new Thread(new Runnable() {

15

16            @Override

17            public void run() {

18                rw.set((int) (Math.random() * 101));

19            }

20            

21        }, "Write:").start();

22        

23        for (int i = 0; i < 100; i++) {

24            new Thread(new Runnable() {

25

26                @Override

27                public void run() {

28                    rw.get();

29                }

30                

31            }, "Read:").start();

32        }

33    }

34 }

35

36 class ReadWriteLockDemo {

37    

38    private int number = 0;

39    

40    private ReadWriteLock lock = new ReentrantReadWriteLock();

41    

42    //读

43    public void get() {

44        lock.readLock().lock();   //上锁

45        try {

46            System.out.println(Thread.currentThread().getName() + " : " + number);

47        } finally {

48            lock.readLock().unlock();   //释放锁

49        }

50    }

51    

52    //写

53    public void set(int number) {

54        lock.writeLock().lock();   //上锁

55        try {

56            System.out.println(Thread.currentThread().getName());

57            this.number = number;

58        } finally {

59            lock.writeLock().unlock();   //释放锁

60        }

61    }

62 }

了解详情请登陆昆明达内IT培训官网（km.tedu.cn）！