interface inheritance?

[Calanthe Wei]

code:
interface Component{}
class Container implements Component{
private Component[] children;
}
Is this demonstrate an "is a" relationship?
I thought "is a" only exit between superclass
and subclass. I mean in the case using extends.
But the answer is yes for the above code.
Can someone give me some idea about it?

[Rob Ross]

Both classes and interfaces can be involved in an "is a " relationship.
In java you can use the instanceof operator to test if an object is an instance of a particular class or interface.

interface Component{}
class Container implements Component{
    private Component[] children;
}
Container myContainer = new Container();
System.out.println(myContainer instanceof Container); //prints [B]true[/B]
System.out.println(myContainer instanceof Component); //prints [B]true[/B].

Rob
[ January 18, 2002: Message edited by: Rob Ross ]

[Calanthe Wei]

Thank you very much!
I got it.

[Maulin Vasavada]

hi calenthe,
go to following topic to get little confuse abt thing about the same concept,
Relationship between Interface and implementing class
regards
maulin.