ruby singleton

/*** @Title Singleton.java * @Package Singleton * @date 2015-1-22 pm 02:39:57 *@versionV1.0*/ PackageSingleton;Importjava.io.Serializable;/*** @ClassName Singleton * @date 2015-1-22 pm 02:39:57*/ Public classSingletonImplementsserializable{Private StaticSingleton instance =NULL; //privatized constructors prevent other objects from being generated PrivateSingleton () {}//There's only one public way. P

, regardless of whether or not it inherits object.If it is python2 and does not inherit object, it is actually only printed to execute the init once. So this is another difference between the py2 and the py3, the difference between the classic class and the new class is very much, and the reflection method of the new class is somewhat different from the classic class. But the general article only says that the difference between the new class and the classic class is only the breadth first and d

that all kinds of clothes are independent and exposed to the outside. They are worn by one piece without order or control. Code Version 3 #-*-Encoding: UTF-8-*-class Person attr_accessor: name def initialize (name = nil) @ name = name end def show puts "***** dress up # {name} \ n" endendclass Finery Articles you may be interested in: Detailed description of the structure of the Combination Mode and Its Application in Ruby Design Mode Programming

Keywords: Ruby on Rails, instantrails, windows, getting started, tutorial I always wanted to try Ruby on Rails, but I was not familiar with Apache and MySQL, and I was not confident in setting up the rails environment. So I never started. After learning about instantrails, finally, we set up the Ruby on Rails Development Environment on Windows and started learni

1. Definition of a singleton patternThe singleton pattern (Singleton Pattern) is a relatively simple pattern, and its original definition is as follows: ensure a class have only one instance, and provide a global point of access to it. That is, ensure that there is only one instance, and instantiate it yourself and provide this instance to the entire System. The

this log problem perfectly, we need to introduce the singleton pattern in design pattern.Single-Case modeWhat is a singleton mode, in Gof's design pattern: The basis of reusable object-oriented software, is to say: Ensure that a class has only one instance and provides a global access point to access it. First, you need to ensure that there is only one instance of a class, and in a class, to construct an i

1.1.1 SummaryIn our daily work we often need to keep a unique instance in the application, such as: IO processing, database operation, etc., because these objects occupy important system resources, so we must limit the creation of these instances or always use a common instance, this is what we are going to introduce today-- Singleton mode (Singleton).High frequency of UseSingle-piece Mode (

Basic Learning notes for Ruby metaprogramming and ruby learning notes Note 1:The Code contains variables, classes, and methods, collectively referred to as language construct ). # test.rbclass Greeting def initialize(text) @text = text end def welcome @text endendmy_obj = Greeting.new("hello")puts my_obj.classputs my_obj.class.instance_methods(false) #false means not inheritedputs my_obj.instance_variable

Singleton of Design Patterns (single state)Banqiao Man http://www.jdon.com 2002/05/07definition :The main purpose of the singleton mode is to ensure that only one instance of a class is present in a Java application.Such a single-threaded operation is required in many operations, such as establishing a directory database connection.Also, Singleton can be state; I

Original article: http://www.cnblogs.com/zhenyulu/articles/37246.html Reference: http://www.dofactory.com/Patterns/PatternSingleton.aspxI. Singleton Mode Features of Singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The

1 single-instance patterns in textbooksWe all know how a simple singleton pattern should be implemented: the constructor is declared as private or protect to prevent being instantiated by an external function, and a private static class pointer is stored inside a unique instance, and the action of the instance is handled by a public class method. The method also returns an instance of the Singleton class.On

Php implements singleton () singleton mode instance and singleton instance. Php implements singleton () singleton mode instance. singleton instance this article describes how to implement sing