Java多线程之并发锁
Java多线程之并发锁
这是自JDK5.0开始提供的Java并发包里面的类
下面是关于Java并发锁的测试代码
- package com.jadyer.thread.lock;
- import java.util.concurrent.locks.Lock;
- import java.util.concurrent.locks.ReentrantLock;
- /**
- * LockTest
- * @author 宏宇
- * @create Mar 1, 2012 7:12:04 PM
- */
- public class LockTest {
- public static void main(String[] args) {
- FoodCenter fc = new FoodCenter();
- new Thread(new ThreadDog(fc, "It is dog`s food")).start();
- new Thread(new ThreadPig(fc, "It is pig`s food")).start();
- }
- }
- class ThreadDog implements Runnable{
- private FoodCenter fc;
- private String foodname;
- public ThreadDog(FoodCenter fc, String foodname){
- this.fc = fc;
- this.foodname = foodname;
- }
- @Override
- public void run() {
- while(true){
- try {
- Thread.sleep(1000);
- } catch (InterruptedException e) {
- e.printStackTrace();
- }
- fc.getFood(foodname);
- }
- }
- }
- class ThreadPig implements Runnable{
- private FoodCenter fc;
- private String foodname;
- public ThreadPig(FoodCenter fc, String foodname){
- this.fc = fc;
- this.foodname = foodname;
- }
- @Override
- public void run() {
- while(true){
- try {
- Thread.sleep(2000);
- } catch (InterruptedException e) {
- e.printStackTrace();
- }
- fc.getFood(foodname);
- }
- }
- }
- /**
- * @see =========================================================================================
- * @see java.util.concurrent是JDK5.0开始提供的Java并发包,其子包locks是专门用于处理线程锁的
- * @see java.util.concurrent.locks.Lock较synchronized关键字比,有一个最大的区别,那就是
- * @see Lock可以比synchronized更细粒度的控制锁,体现在try{...}finally{mylock.unlock();}
- * @see =========================================================================================
- * @see Lock有点像公共厕所的门闩,只有正在使用厕所的人,把门闩打开出来了,其它人才可以使用公厕
- * @see Lock比传统线程模型中的synchronized方式更加面向对象。与生活中的锁类似,锁本身也应该是一个对象
- * @see 两个线程执行的代码片段要实现同步互斥的效果,那么这两个线程所使用的必须是同一个Lock对象
- * @see 并且,锁应该位于待操作的资源类的内部方法中,而非线程代码中
- * @see =========================================================================================
- */
- class FoodCenter {
- Lock mylock = new ReentrantLock(); //创建一个锁
- public void getFood(String name) {
- int len = name.length();
- mylock.lock(); //上锁
- try {
- for (int i = 0; i < len; i++) {
- System.out.print(name.charAt(i));
- }
- System.out.println();
- } finally {
- mylock.unlock(); //解锁
- }
- }
- }
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