Java Singleton Implementation 概述 Java中单例模式的实现有多重方法, 要实现单例模式主要的问题是线程安全问题以及对Lazy Load的考虑,主要有如下几种 双重锁定懒加载单例 预加载单例 枚举单例 双重锁定懒加载单例模式 /** * 双重锁定懒加载单例实现 * * @author zhenwei.liu created on 2013 13-9-23 上午...
using System;using System.Threading;namespace Singleton{ // This Singleton implementation is called "double check lock". It is safe // in multithreaded environment and provides lazy initialization for the // Singleton object. class Singleton { private Singleton() { } private static Singleton _insta...
Extra if condition Looking at all the three ways to achieve thread-safety, I think the third one is the best option. In that case, the modified class will look like this: The local variableresultseems unnecessary. But, it’s there to improve the performance of our code. In cases where ...
publicclassSingleton{privatevolatilestaticSingleton uniqueInstance;privateSingleton(){}publicstaticSingletongetUniqueInstance(){if(uniqueInstance==null){synchronized(Singleton.class){if(uniqueInstance==null){uniqueInstance=newSingleton();}}}returnuniqueInstance;}} 考虑下面的实现,也就是只使用了一个 if 语句。
类图(Class Diagram) 使用一个私有构造函数、一个私有静态变量以及一个公有静态函数实现。 私有构造函数确保不能通过构造函数来创建对象,只能通过公有静态函数返回唯一的私有静态变量。 实现(Implementation) I 懒汉式-线程不安全 以下实现中,私有静态变量 uniqueInstance 被延迟实例化,这样做的好处是,如果没有用到该类...
Here we will take a look at a real implementation of Singleton in Java. Java单例模式实现: AI检测代码解析 public class Scoreboard { public int currentScore; //we will use this for the score later on private static Scoreboard singleton = null; //this we will need for the implementation ...
Paulhas a good implementation except that we shouldn't use the same object/class to synchronize over. We should have a private monitor that does that. 22nd May 2019, 1:11 AM Chriptus13 + 1 By pure curiosityChriptus13, why wouldn't you use the same object for synchronization ?
* - Unity Implementation of Singleton template * */ using UnityEngine; /// /// Be aware this will not prevent a non singleton constructor /// such as `T myT = new T();` /// To prevent that, add `protected T () {}` to your singleton class. /// //...
One benefit common to both of these options is that you don't have to change the implementation of your Singleton class to support multithreading. 1. Static initialization. Static initializers get called before main(), where you can normally assume that the program is still single threaded. ...
Every class can implement a companion object, which is an object that is common to all instances of that class. It’d come to be similar to static fields in Java. An implementation example: class App : Application() { companion object { lateinit var instance: App private set } override ...