Summary of characteristics of Java polymorphic members

1: Member variables, compile-time: Refer to the class in which the reference variable belongs to has the member variable called, has, compiles through, no, compiles failed.

Run-time: production test whether the referenced variable belongs to a class that has a calling member variable and runs the member variable in the owning class.

(Simple: Compile and run-time reference to the left of the equals sign)

2: Member functions compile-time: Refer to the class in which the referenced variable belongs to have the function called, have, compile through, no, compile failed.

Runtime: Refer to whether the object belongs to a class that has a function called, there, compile through, no, compile failed.

(Simply put: look to the left at compile time, see right at runtime)

3: Static functions, compile time: Refer to the class in which the reference variable belongs has a static method called, there, compile through, no, compile failed.

Runtime: Refer to the class in which the reference variable belongs has a static method called, there, compile through, no, compile failed.

(Simple: Compile and run look to the left) "static method can be called directly with the class name."

1 Importjava.util.ArrayList;2 ImportJava.util.Iterator;3 Importjava.util.List;4 5  Public classTest {6 7      Public Static voidMain (string[] args) {8         //TODO auto-generated Method Stub9A A =NewB ();TenA.dosomething ();//wo shi A OneA.B ();//hi:b ASystem.out.println (A.AA);//8 -  -     } the  - } -  - classA { +     intAA = 8; -  +      PublicA () { ASystem.out.println ("A"); at     } -  -      Public Static voiddosomething () { -System.out.println ("Wo shi A"); -     } -  in      Public voidB () { -System.out.println ("Hi:a"); to     } +  - } the  * classBextendsA { $     intAA = 10;Panax Notoginseng  -      PublicB () { theSystem.out.println ("B"); +     } A  the      Public Static voiddosomething () { +System.out.println ("Wo shi B"); -     } $  $      Public voidB () { -System.out.println ("Hi:b"); -     } the  -}

3 Examples of features

The result is:

A
B
Wo Shi A
Hi:b
8

Summary of characteristics of Java polymorphic members