package cn.thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** *  *  * @author 林计钦 * @version 1.0 2013-7-25 上午10:33:37 */public class LockTest {    public static void main(String[] args) {        LockTest test = new LockTest();        // 创建并发访问的账户        MyCount myCount = test.new MyCount("95599200901215522", 10000);        // 创建一个锁对象        Lock lock = new ReentrantLock();        // 创建一个线程池        ExecutorService pool = Executors.newCachedThreadPool();        // 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);        User u2 = test.new User("张三他爹", myCount, 6000, lock);        User u3 = test.new User("张三他弟", myCount, -8000, lock);        User u4 = test.new User("张三", myCount, 800, lock);        // 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);        // 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 Lock myLock; // 执行操作所需的锁对象        User(String name, MyCount myCount, int iocash, Lock myLock) {            this.name = name;            this.myCount = myCount;            this.iocash = iocash;            this.myLock = myLock;        }        public void run() {            String string;            if(iocash>0){                string="存款";            }else{                string="取款";            }                        // 获取锁            myLock.lock();            // 执行现金业务            System.out.println(name + "正在操作" + myCount + "账户，" +                     string+"金额为" + iocash + "，当前金额为" + myCount.getCash());            myCount.setCash(myCount.getCash() + iocash);            System.out.println(name + "操作" + myCount + "账户成功，"+                     string + "金额为" + iocash + "，当前金额为" + myCount.getCash());            System.out.println("============");            // 释放锁，否则别的线程没有机会执行了            myLock.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;        }        @Override        public String toString() {            return "MyCount{" + "账号=‘" + oid + ‘\‘‘ + ", 余额=" + cash + ‘}‘;        }    }}

张三正在操作MyCount{账号=‘95599200901215522‘, 余额=10000}账户，取款金额为-4000，当前金额为10000张三操作MyCount{账号=‘95599200901215522‘, 余额=6000}账户成功，取款金额为-4000，当前金额为6000============张三他弟正在操作MyCount{账号=‘95599200901215522‘, 余额=6000}账户，取款金额为-8000，当前金额为6000张三他弟操作MyCount{账号=‘95599200901215522‘, 余额=-2000}账户成功，取款金额为-8000，当前金额为-2000============张三他爹正在操作MyCount{账号=‘95599200901215522‘, 余额=-2000}账户，存款金额为6000，当前金额为-2000张三他爹操作MyCount{账号=‘95599200901215522‘, 余额=4000}账户成功，存款金额为6000，当前金额为4000============张三正在操作MyCount{账号=‘95599200901215522‘, 余额=4000}账户，存款金额为800，当前金额为4000张三操作MyCount{账号=‘95599200901215522‘, 余额=4800}账户成功，存款金额为800，当前金额为4800============