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Nested classes

Sharanya Sharma
Ranch Hand

Joined: Jul 26, 2004
Posts: 54
Hi,

This is one of the question in nested classes of K&B

public class Foo
{
Foo() {System.out.print("Foo");}
class Bar{
Bar() {System.out.print("Bar");}
public void go() {System.out.print("Hi");}
}
public static void main(String args[]){
Foo f = new Foo();
f.makeBar();
}
void makeBar(){
(new Bar() {}).go();
}
}

The result of the above code is given as "FooBarHi".

But as the makeBar method, while invoking new Bar(){} it is creating a new empty subclass of Bar class rather than invoking the constructor of Bar class. As the go() method is invoked on anonymous empty subclass, it should give a compile error.

Please clarify me if I have interpreted the code wrongly or if my assumption is wrong.

Thanks
Sharanya
kavya krushi
Ranch Hand

Joined: Oct 25, 2000
Posts: 48
Sharanya,

The object created in the makeBar() method is an instance of anonymous "subclass" of Bar. Since you did not override the go() method, it will be inherited from the parent class.

Kavya Krushi
[ July 28, 2004: Message edited by: kavya krushi ]
Sharanya Sharma
Ranch Hand

Joined: Jul 26, 2004
Posts: 54
Thanks for the reply. I think I was carried away with the concept of anonymous nested class to consider the basic subclass theory.
 
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