多线程下单例的实现

多线程下单例的实现

     public class XXUtil{
         // 实例化
         private static XXUtil _instance ;
         // 工具"锁"
         private static object LOCK= new objest();
         // 私有化
         private XXUtil(){}
         // 获取对象
         public static XXUtil getInstance(){
             lock (LOCK){
                 if (_instance == null){
                     _instance = new XXUtil();
                 }
             }
             return _instance;
         }
     }