ReadWriteLock 读写锁

ReadWriteLock 读写锁

package com.atguigu.juc; import java.util.concurrent.locks.ReadWriteLock; import java.util.concurrent.locks.ReentrantReadWriteLock; /* * 1. ReadWriteLock : 读写锁 * * 写写/读写 需要“互斥” * 读读 不需要互斥 * */ public class TestReadWriteLock { public static void main(String[] args) { ReadWriteLockDemo rw = new ReadWriteLockDemo(); new Thread(new Runnable() { @Override public void run() { rw.set((int)(Math.random() * 101)); } }, "Write:").start(); for (int i = 0; i < 100; i++) { new Thread(new Runnable() { @Override public void run() { rw.get(); } }).start(); } } } class ReadWriteLockDemo{ private int number = 0; private ReadWriteLock lock = new ReentrantReadWriteLock(); //读 public void get(){ lock.readLock().lock(); //上锁 try{ System.out.println(Thread.currentThread().getName() + " : " + number); }finally{ lock.readLock().unlock(); //释放锁 } } //写 public void set(int number){ lock.writeLock().lock(); try{ System.out.println(Thread.currentThread().getName()); this.number = number; }finally{ lock.writeLock().unlock(); } } }