Object-oriented initialization of Java Note 12

1 overview

Class: is a set of related properties and behaviors. is an abstract concept.
Object: Is the concrete manifestation of this kind of thing. Specific existence of the individual.

(1) Object oriented thinking
Object-oriented is a process-oriented programming idea.

Process oriented: Emphasis on the steps of each of these functions
Object-oriented: emphasizes the object and then invokes the function by the object

(2): Object-oriented thinking features
A: It's a thought that's more in line with our thinking habits.
B: Complex things can be simplified
C: Turning us from the executor to the conductor

Example:
Buy a computer:
Process-oriented: My understanding of the computer--understand my own needs--find the corresponding parameter information--go to Zhongguancun to buy a computer--bargain--Buy back the computer
Object-oriented: I know I want to buy a computer--the squad leader buys it for me--the monitor buys it back.
Eat:
Process oriented: Go to the supermarket to buy food---------------------------------
Object-oriented: Dinner at the restaurant, you-waiter (à la carte)-Chef (cooking)-Waiter (end dish)--eat
Example: Student class

1 /*2 things:3 information Description of a property thing4 the function of a behavioral thing5     6 class:7 property of a member variable thing8 the behavior of a member method thing9         Ten defining a class is actually a member variable and a member method that defines the class.  One      A case: Let's complete a student class definition.  -      - Student Things: the Properties: Name, age, Address ... - behavior: Study, eat, sleep ... -          - To convert a thing to a corresponding class: +      - Student class: + member variables: Name, age, Address ... A member methods: Learn, eat, sleep ... at          - member variables: the same format as the definition of the previous variable, but in a different location, outside the method in the class.  - member method: the same format as the previous method definition, but today the static is removed first.  -      - First we should define a class and then complete the members of the class.  - */ in //This is my student class. - classStudent { to     //Defining Variables +     //name - String name; the     //Age *     intAge ; $     //AddressPanax Notoginseng String address; -      the     //Defining Methods +     //How to learn A      Public voidStudy () { theSYSTEM.OUT.PRINTLN ("Students Love learning"); +     } -      $     //the way to eat $      Public voideat () { -System.out.println ("Tired of learning, to play games"); -     } the      -     //the way to sleepWuyi      Public voidsleep () { theSystem.out.println ("The game is tired, to sleep.")); -     } Wu}

Example 2 Phone class

1 /*2 test of mobile phone class3 */4 classPhone {5     //Brand6 String brand;7     //Price8     intPrice ;9     //ColorTen String color; One      A     //How to call -      Public voidCall (String name) { -SYSTEM.OUT.PRINTLN ("Call" +name+ "); the     } -      -     //How to send text messages -      Public voidSendMessage () { +SYSTEM.OUT.PRINTLN ("Mass sms"); -     } +      A     //How to play the game at      Public voidPlayGame () { -System.out.println ("Play games"); -     } - } -  - classPhonedemo { in      Public Static voidMain (string[] args) { -         //Create a Phone object to         //Class Name Object name = new class name (); +Phone p =NewPhone (); -          the         //Direct output member variable value *System.out.println (p.brand+ "---" +p.price+ "---" +p.color); $         Panax Notoginseng         //Assigning a value to a member variable -P.brand = "Nokia"; theP.price = 100; +P.color = "Gray"; A         //Output Again theSystem.out.println (p.brand+ "---" +p.price+ "---" +p.color); +          -         //Calling Methods $P.call ("Brigitte"); $ p.sendmessage (); - p.playgame (); -     } the}

3 Object Memory Graph

Object-oriented initialization of Java Note 12