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Why do we need interface return type?

 
Greenhorn
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Hi All,
I would like to know why do we need an interface return type? Can anybody gimme an example please?
 
Ranch Hand
Posts: 242
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Hi kathik prasad

See the code below


interface Animal{}

class Elephant implements Animal{}
class Tiger implements Animal{}

public class Main
{
final static public void main(String[] args)
{
Animal animal = method(args[0]);
}

public static Animal method(String arg)
{
if(arg.equals("Vegie"))
return new Elephant();
else
return new Tiger();
}
}


Here which object to be created depends on the input from user..

And mostly we use abstract classes and interfaces to have common parent type..Or to make use of polymorphism..

Regards..
 
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