package cn.thread;import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;/*** 读写锁* * @author 林计钦* @version 1.0 2013-7-25 上午10:33:37*/
public class WriteReadLockTest {public static void main(String[] args) {WriteReadLockTest test = new WriteReadLockTest();// 创建并发访问的账户MyCount myCount = test.new MyCount("95599200901215522", 10000);// 创建一个锁对象ReadWriteLock lock = new ReentrantReadWriteLock(false);// 创建一个线程池ExecutorService pool = Executors.newFixedThreadPool(2);// 创建一些并发访问用户，一个信用卡，存的存，取的取，好热闹啊User u1 = test.new User("张三", myCount, -4000, lock, false);User u2 = test.new User("张三他爹", myCount, 6000, lock, false);User u3 = test.new User("张三他弟", myCount, -8000, lock, false);User u4 = test.new User("张三", myCount, 800, lock, false);User u5 = test.new User("张三他爹", myCount, 0, lock, true);// 在线程池中执行各个用户的操作pool.execute(u1);pool.execute(u2);pool.execute(u3);pool.execute(u4);pool.execute(u5);// 关闭线程池pool.shutdown();}/*** 信用卡的用户*/class User implements Runnable {private String name; // 用户名private MyCount myCount; // 所要操作的账户private int iocash; // 操作的金额，当然有正负之分了private ReadWriteLock myLock; // 执行操作所需的锁对象private boolean ischeck; // 是否查询User(String name, MyCount myCount, int iocash, ReadWriteLock myLock, boolean ischeck) {this.name = name;this.myCount = myCount;this.iocash = iocash;this.myLock = myLock;this.ischeck = ischeck;}public void run() {if (ischeck) {// 获取读锁myLock.readLock().lock();System.out.println("读：" + name + "正在查询" + myCount + "账户，当前金额为" + myCount.getCash());// 释放读锁myLock.readLock().unlock();} else {// 获取写锁myLock.writeLock().lock();// 执行现金业务System.out.println("写：" + name + "正在操作" + myCount + "账户，金额为" + iocash + "，当前金额为"+ myCount.getCash());myCount.setCash(myCount.getCash() + iocash);System.out.println("写：" + name + "操作" + myCount + "账户成功，金额为" + iocash + "，当前金额为"+ myCount.getCash());// 释放写锁myLock.writeLock().unlock();}}}/*** 信用卡账户，可随意透支*/class MyCount {private String oid; // 账号private int cash; // 账户余额MyCount(String oid, int cash) {this.oid = oid;this.cash = cash;}public String getOid() {return oid;}public void setOid(String oid) {this.oid = oid;}public int getCash() {return cash;}public void setCash(int cash) {this.cash = cash;}@Overridepublic String toString() {return "MyCount{" + "oid='" + oid + '\'' + ", cash=" + cash + '}';}}
}

写：张三正在操作MyCount{oid='95599200901215522', cash=10000}账户，金额为-4000，当前金额为10000
写：张三操作MyCount{oid='95599200901215522', cash=6000}账户成功，金额为-4000，当前金额为6000
写：张三他爹正在操作MyCount{oid='95599200901215522', cash=6000}账户，金额为6000，当前金额为6000
写：张三他爹操作MyCount{oid='95599200901215522', cash=12000}账户成功，金额为6000，当前金额为12000
写：张三正在操作MyCount{oid='95599200901215522', cash=12000}账户，金额为800，当前金额为12000
写：张三操作MyCount{oid='95599200901215522', cash=12800}账户成功，金额为800，当前金额为12800
写：张三他弟正在操作MyCount{oid='95599200901215522', cash=12800}账户，金额为-8000，当前金额为12800
写：张三他弟操作MyCount{oid='95599200901215522', cash=4800}账户成功，金额为-8000，当前金额为4800
读：张三他爹正在查询MyCount{oid='95599200901215522', cash=4800}账户，当前金额为4800