static and final

ObjectiveIn just learn programming not long to hear the design model of the name, but because at that time was a thoroughly bottom rookie, and did not touch. It was not until the simple business code became familiar with the initial work that the

A constant is a quantity that is unchanged from the beginning of the program to the end. In Java programming, use the keyword "final" to declare a constant, such as the following program code.The x here is a constant, but it is a constant within a

1. Common Design PatternsSingleton mode: Lazy, a hungry man, double check lock, static load, internal class loading, enumeration class loading. Ensure that a class has only one instance and provides a global access point to access it.Proxy mode:

Object-Oriented Programming:1. Basic Features: Abstraction, encapsulation, inheritance, polymorphism.2. Class and member access control: private: In the same class; default: In the same package; protected: Subclass; public: all;3. Inherit--[access

Construction and destructionL can define an initialization function, but all variables inside the class are initialized before the initialization function.L can directly initialize variables when they are directly defined in the class.The order in

9.1 Abstract classes and abstract methodsWhen applying inheritance, many of the methods of the base class are generic interfaces of subclasses, which themselves have no practical meaning. There is no point in creating a base class object, and we

Today looked at their own blog article, the content is more miscellaneous, there are a lot of technology, there are many languages, have not highlighted their strengths, can say, from the blog, I do not see what is the block. Plus today was awarded

Interface (English: Interface), which is an abstract type in the Java programming language, is a collection of abstract methods, and interfaces are usually declared with Interface. A class inherits the abstract method of an interface by inheriting

One: Single case design modeSingleton is a pattern of creation in which a class takes Singleton mode, and when the class is created, it is possible to produce only one instance for external access and a global access point .Features of the

Generally speaking, when you create a class, you are describing the appearance and behavior of the object of that class. Unless you create the object of that class with new, you don't actually get anything. When you create an object with new, the

In Java, a variable of the parent class can refer to an instance of the parent class, or it can refer to an instance of the child class.Please read the code first: Public class Demo { public static void main(String[] args) { people

Java Review Summary naming methodThe name of the created file should match the name of the class, or it will be an error.Class is named in uppercase letters, and if it is the class name of multiple words, the first letter of each word is capitalized,

1. In the declaration of a class, create a subclass of a class with the keyword extends. A class declares itself to use one or more interfaces through the keyword implements.Extends is inherited from a class, you can use the parent class method

In object-oriented concepts, we know that all objects are depicted by classes, but not all classes are used to depict objects, and if a class does not contain enough information to depict a specific object, such a class is an abstract

Static represents the meaning of "global" or "static", which modifies member variables and member methods, and can also form statically static blocks of code, but there is no concept of global variables in the Java language.member variables and

1. Abstract class 1.1 Abstract class conceptsWhen some methods of the parent class are not deterministic, you can use the abstract keyword to decorate the method [abstract method] and use abstract to decorate the class [abstract class]. //the

Original address:http://www.iteye.com/topic/323547We all know that AOP uses the proxy mode, this article mainly introduces the two proxy mode how to set up and the difference, the original text of some of the contents of the reference after the

Access Rights controlAccess Rights control: Java provides access control modifiers to control access rights. Permissions from large to small, in turn, public,protected, package access (no keywords), private. Package: library Unit

Construction Method Details Summary ~~~~~1: First to understand why you need to construct a method ,, there are too many properties in the class, each time to assign a value to the property is very troublesome: the encoding is large, you cannot

Java interfaceInterface (English: Interface), which is an abstract type in the Java programming language, is a collection of abstract methods, and interfaces are usually declared with Interface. A class inherits the abstract method of an interface