Basic Inheritance Question

[kalpana Kumar]

Hi all,
I am preparing for JCP.
This is a very preliminary question
Here is my sample code

class trial{
 private int test=10;
int test1=20;
int trying()
{
return test;
}
}
class B extends trial{
int test()
{
int k=super.test1;
return k;
}
 
void value(){
System.out.println("this is the value test"+super.trying());
}
}
 
class inheritclass{
public static void main(String args[])
{
int val=new B().test();
B b = new B();
trial t=new trial();
t = b;//what is the use of this 
//b=t;
System.out.println("test"+t.test());
new B().value();
}
}
 

t = b;//what is the use of this assignment when I am not able to access the
methods of b?.

I would like to know in the real-time scenario.

Thanks
[ November 08, 2004: Message edited by: Barry Gaunt ]

[Barry Gaunt]

Moved here from SCJP.

I would like to know in the real-time scenario

Could you please explain this?
[ November 08, 2004: Message edited by: Barry Gaunt ]

[Barry Gaunt]

You wrote this code. Did you have any purpose in mind?

[Francis Palattao]

<quote>
t = b;//what is the use of this assignment when I am not able to access the
methods of b?.
</quote>

you get to use polymorphism. if you have another object that is subclassed by T and have a different method implementation. You will now use that objects implementation.

[jefff willis]

Think of it terms of using lists...

Collection col = new ArrayList();

Is basically doing the same thing...

There was a thread on here not long ago that spoke more specifically about that particular example. Maybe you could do a search on it...

I'm not sure how you would find it exactly, but try searching for this as the topic: "Initializing ArrayList()..."