实现方式二 package cn.devdoc.dp.creational.singleton;/** * * @author CK * */public class Singleton2 { private static Singleton2 instance; private Singleton2() { } public static Singleton2 getInstance() { if (instance == null) { // 在多线程的时候这里会出问题，导致的...
Java中的单例模式(Singleton Pattern in Java) Introduction# 单例模式在很多的框架中被广泛使用。 对于系统中的某个类来说,只有一个实例是很重要的,比如只能有一个timer和ID Producer。又比如在服务器程序中,配置信息保留在一个文件中,这些配置信息只由一个单例对象统一获取,进程中的其他对象通过这个单例对象获取...
Here is a singleton design pattern example. Simple Singleton Pattern: (Lazy Initialization + ThreadSafe with synchronized block) This implementation uses the same double-checkedlockingmechanism as in the previous implementation. The addedlogging statementshelp demonstrate when the instance is being created ...
2. Links and Literature 2.1. vogella Java example code Singletons. This article describes the Design Pattern "Singleton" and its usage in the programming language Java. 1. The Singleton Pattern in Java 1.1. Overview In Java, the Singleton pattern ensures that only one instance of a class is...
java设计模式:单例模式(Singleton Pattern) 单例模式(Singleton Pattern) 1.单例模式概述 2.懒汉式单例 3.饿汉式单例 4.单例在多线程中的实现方式 4.1 同步方法 4.2 双重锁定 4.3 静态内部类 4.4 枚举方式 5.总结 1.单例模式概述 单例就是在系统内存中只存在一个对象,用来节约系统资源,减少频繁创建和销毁...
在Java 中应用设计模式 -- Singleton刘湛
2、java中共有23种设计模式 二、单例设计模式(Singleton Pattern):解决一个类在内存只存在一个对象 1、在大部分时候,我们把类的构造器定义成public访问权限,允许任何类自由创建该类的对象。但在某些时候,允许其他类自由创建该类的对象没有任何意义,还可能造成系统性能下降(因为频繁地创建对象、回收对象带来的系统开销...
Singleton design pattern is used in core Java classes also (for example,java.lang.Runtime,java.awt.Desktop). Java Singleton Pattern Implementation To implement a singleton pattern, we have different approaches, but all of them have the following common concepts. ...
<Here are ALL other Java Design Patterns, explained in detail with examples>Singleton Pattern by ExampleThis pattern can be implemented in two different waysEager initialization: In this method object of class is created when it is loaded to the memory by JVM. It is done by assigning the ...
Singleton design pattern in Java By: Rajesh P.S.In object-oriented programming, the Singleton pattern exerts its influence by confining the instantiation of a class and assuring the exclusive existence of a solitary instance within the Java Virtual Machine (JVM). Put simply, this pattern demands ...