Type Conversion

[Swati Kadam]

class A{}
class B extends A implements E{}//line 1
class C extends A{}
class D extends B{}
interface E{}
public class Question07 {
public static void main(String[] args) {
A a = new D();//line 2
C c = new C();//line 3
E e = (E)a;//line 4
B b = (B)e;//line 5
}
}
Why it allows type conversion on line 4???

[marc weber]

'a' references an object that was created with "new D()." D extends B, and B implements E. So the object referenced by 'a' IS-AN E.

[Gitesh Ramchandani]

Dear Swati,

Please quote your source, it will help others also.

Regards,
Gitesh