Java and object-oriented design

1 Object-oriented and process-oriented

Features of 2.OO

(1) Encapsulation

(2) Inheritance

(3) Polymorphism

3.Class and Object

(1) Define a class

(2) gloables and local variables

(3) constructor ' s defination and application

(4) Create an object

Declration an Object

Allocate memory

(5) Use an object

Use the member variables and change them

Use the member function

Use operator '. ' To access the member variables and functions

(6) Deallocate an object

Java use the ' garbage collection ' to deallocate the Memory:first:estimate whether a variable are in use; Second:deallocate

Java also provide a function "finalize ()" Before "garbage collection" for "garbage collection System" (Got hazed, GCs are D Iffer from GC?)

4.use Packages

def: (1) In essence facilate the search and use of a specfic class

(2) There exists the Cogniminal class, to some extent, this can avoid the conflict of nominate

(3) In Java, Access right, measured in packages

Create a package:

Use classes in the same package and public classes in other packages:

(1) long names connected by dot

(2) Use keyword ' import ': Import pack.class|*

This article is from "Maugham's Advanced Journey" blog, please make sure to keep this source http://maugham.blog.51cto.com/13056751/1969777

Java and object-oriented design