20 Replication of functions

Learning Essentials

1. Replication of functions (override)

2. Call the member function of the parent class using Super

This (): Call a constructor in this class

This. : Call a member function in this class

Super (): Call the constructor in the parent class

Super (): Call a member function in the parent class

Class person{string name, int age, void introduce () {System.out.println ("My Name is" +name+ ", I Am" + ");}

Replication (override)//1. In the two classes that have a parent-child relationship,//2. The parent class and subclass each have a function, the definitions of the two functions (return value type, function name, and argument list) are exactly the same class Student extends person{string  Address;void introduce () {//system.out.println ("My name is" + name+ ", my Age is" +age "); Super.introduce ();//Call the parent class member function Objective to reduce duplication of code System.out.println ("My home in" + Address);}}

Class Test{public static void Main (String args[]) {Student s = new Student (); s.name = "Lin Feng"; s.age = 20;s.address = "Beijing"; s.in Troduce ();}}

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20 Replication of functions