Java ConcurrentHashMap存入引用对象时也是线程安全的

开源中国博客地址

本人小白,看到资料说ConcurrentHashMap是线程安全的,get过程不需要加锁,put是线程安全的,推荐高并发时使用.但是本人不清楚是否该map中存入的引用类型对象,对象属性变化也是否线程安全的,看了很多资料,貌似都没说明这一点,所以写代码测试一下,

package testConcurrentHashMap;import java.util.concurrent.ConcurrentHashMap;/** * Created by xuzimian on 17-3-1. */public class testConcurrentHashMap { public ConcurrentHashMap<String,TestModel> map=new ConcurrentHashMap();    public void testFunc(){        map.put("test",new TestModel(1));        Thread thread = new Thread() {            @Override            public void run() {                int n=0;                while (n<100){                    System.out.PRintln("线程1" + ":" + map.get("test"). getValue());                    map.get("test").setValue(map.get("test").getValue()+1);                    n++;                    //ConcurrentUtils.sleep(10);                    try {                        Thread.sleep(60);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        };        thread.run();        Thread thread1 = new Thread() {            @Override            public void run() {                int n = 0;                while(n<100) {                    System.out.println("线程2" + ":" + map.get("test"). getValue());                    n++;                    ConcurrentUtils.sleep(1);                }            }        };        thread1.run();    }}
结果如下:
线程1:1线程1:2线程1:3线程1:4线程1:5线程1:6线程1:7线程1:8线程1:9线程1:10线程1:11线程1:12线程1:13......省略线程1:100线程2:101......省略线程2:101线程2:101
通过结果可以知道其存入的元素哪怕是引用类型对象,也是线程安全的