Using Java to implement object-oriented Chapter I.

Chapter One: Abstraction and encapsulation

Class is an abstraction of an object that is an instance of a class

Second, the use of object-oriented design

The process of object-oriented design is an abstract process, which is done in three steps:

1. Find out what kind of it

2. Find out its properties

3. Find out how it behaves

Naming rules for class names, attribute names, method names, and constant names:

1. The class name consists of one or several words, with the first letter of each word capitalized, such as dog, StringBuffer

2. The attribute name and method name consist of one or more words, the first letter is lowercase, the other words are capitalized, such as Health,stuname,println (), GetMessage ().

3. The constant name consists of one or more words, all uppercase letters, such as Pi,sex_male

Four, Static constants

1.static can be used to modify properties, methods, and code blocks

2.static decorated properties and methods are called Class properties (class variables), class methods

3. Properties and methods that do not use static adornments, belong to a single object, often referred to as instance properties (instance variables), instance methods

4.static modified variables and methods can be accessed through the class name and object name, instead of static modified variables and methods can only be accessed through the object name

	Static non-private decoration	Non-static, private decoration
Property	Class properties, class variables	Instance properties, instance variables
Method	Class method	Instance method
Calling methods	Class name. properties Class name. Method () Object. Properties Object. Method ()	Object. Properties Object. Method ()
Belong	Class	Single Object

5.final can be used to modify properties, methods, and classes

6. The final modified variable becomes constant and its value is fixed

Using Java to implement object-oriented Chapter I.