casting

[Shardul Kumar]

 import java.io.*;

class A{}
class B extends A{}
class C extends A implements Serializable{}
final class D extends B{}

public class Refcast{
     public static void main(String args[]){
          A a=new A();
          B b=new B();
          C c=new C();
          D d=new D();
          Object ob=c; //Line-1
          d=(D)ob; //Line-2
          d=(D)new B(); //Line-3
          c=(C)new Serializable(){}; //Line-4
     }
}   

how line 2 is working and rest of the line followed by it..

actually this problem is about which lines give an exception..

[Siva Masilamani]

Has been discussed here.

Link