polymorphic reference variables

[adam Lui]

by declaring a reference variable of the superclass type and have that reference variable refer to an instance of a subclass type, WHATs the benefit? can anyone show an example?

[Ameen khan]

the benefit is dynamic method Dispatch, versioning, latebinding

class A{
void method1(){
System.Out.print("methodA");
}}
public class B extends A{
void method1(){
System.Out.print("methodB");
}
public static void main(String[] args){
A a = new B();
a.method1(); //answer will be methodB
 
}
}
 

[ September 29, 2007: Message edited by: Ameen khan ]

[ahmed yehia]

See this post for a longer dicussion.