Second, Java object-oriented (8) _ Inheritance thought--super keyword

2018-05-01

Super keyword

What is super?

This: Represents the current object itself, or an instance of the current class, through which all methods and properties of this object can be called.

Super: Represents the parent class object of the current object. ( is a reference to the parent class object in the Subclass object )

use super in the Java class to refer to the composition of the parent class, use this to refer to the current object , and if a class inherits from another class, when we new the instance object of the subclass, there will be a parent class object inside the subclass object.

How do you refer to the parent object inside? Using Super to refer to, this refers to a reference to the current object, and super is a reference to the parent object inside the current object.

code example:

1 //Birds2 classBird3 {4      Public voidFly () {5SYSTEM.OUT.PRINTLN ("Free Flight");6     }7 }8 //Penguin9 Ten classPenguinextendsBird One { A      -      Public voidFly () { -System.out.println ("The angel of the Broken Wing"); the     } -      Public voidsay () { -SYSTEM.OUT.PRINTLN ("I Want to sing hahaha"); -         Super. Fly ();//use Super as the reference object of the parent class object to invoke the Fly () method inside the parent class object +     } - } +  A //Super keyword at classSuperdemo - { -      Public Static voidMain (string[] args) -     { -         //Create a Penguin object -Penguin p =NewPenguin (); in         //call the Fly method - P.say (); to     } +}

Output Result:

Memory Analysis:

Reference blog:

Https://www.cnblogs.com/danbing/p/5034108.html

Https://www.cnblogs.com/ahfz/p/5890631.html

Second, Java object-oriented (8) _ Inheritance thought--super keyword