. NET Learning notes----2015-07-21 (C # Basics Review 07, keywords, access modifiers)

1. New keyword:

1), creating objects

2), Hide members inherited from the parent class

What is object-oriented?

A way to analyze the problem (enhancing the scalability of the program)

Three main features of object-oriented: encapsulation, inheritance, polymorphism

Class? Object? What are the differences between classes and objects?

* Classes are molds that determine the characteristics (attributes) and behaviors (methods) that an object will have

* object is a concrete entity that you can see and touch---everything.

The class is the stencil that creates the object of the stencil, abstract.

1), class is a data type, user-defined data type

2), the composition of the class: Fields, properties, methods, constructors, etc.

The object is specific and is a concrete instance of the class. Objects have attributes (features) and methods (behaviors)

class contains class data (represented by fields) and behavior (represented by methods (functions, functions) as a piece of code with a name)

*this calling its own constructor for the current object display

*base calls the constructor of the parent class and calls the parent class's name method in the subclass

2. Access modifier:

Public: openly, publicly

Private: Accessible only within the current class, members of the class if no access modifier defaults to private

procteced: Protected, can be accessed inside the current class, or in subclasses of the class

Internal: Access modifiers that can be used to decorate classes are available in the current project only: internal and public

proctected internal:

3. Common key Words

This: The object of the current class calls its own constructor

Base: Calling a member of the parent class

NEW: Create object to hide members of parent class

Virtual: Mark a method as a virtual method

Abstract: An abstraction

Override: Override

Interface: interface

Partial: Partial Classes

Sealed: Seal class

Return: Returns the value returned in the method immediately ends this method

Break: Jump out of the current loop

Continue: End this cycle return to the loop condition to judge

Static: Statically

struct: Structure

Enum: enum

Const: constant

    /// <summary>    ///sealed sealed class, that he can not be inherited, but he can inherit others/// </summary>     Public Sealed classTeacher {}/// <summary>    ///The partial indicates that this class is part of the person class, essentially the following two classes are a class/// </summary>     Public Partial classPerson {Private string_name; }     Public Partial classPerson {Private int_age; }

. NET Learning notes----2015-07-21 (C # Basics Review 07, keywords, access modifiers)