Inheritance 1: Basic Example Next: Polymorphism & Dynamic Binding Up: Java Notes Previous: Inheritance: Overriding Inheritance 1: Basic Example
/**
* This code is from the book:
* Winder, R and Roberts, G (1998)
* Developing Java Software
* John Wiley & Sons.
* It is copyright (c) 1997 Russel Winder
* and Graham Roberts.
*/
class Superclass{
public void supermethod(){
System.out.println("Superclass");
}
}
//This class inherits supermethod from Superclass
//so that it can be called for subclass objects
class Subclass extends Superclass{
public void submethod(){
System.out.println("Subclass");
}
}
class l1Inherit1{//Inherit1
public static void main(String[] args){
//Create a superclass object and call a
//superclass method
Superclass superclass = new Superclass();
superclass.supermethod();
//Create a subclass object and call both
//a subclass and superclass method
Subclass subclass = new Subclass();
subclass.supermethod();
subclass.submethod();
//This assignment is valid, the reverse is not.
superclass = subclass;
}
}
/******** sample compilation & run ********
# javac l1Inherit1.java
# java l1Inherit1
Superclass
Superclass
Subclass
#
******************************************/
Ananda Amatya 9/15/1999
