How to Clone inherited Object ?

Question

According to the rule of cloning a object can be cloned only if
it implements Cloneable interface ? In the following example
class B extends class A which does not implement Cloneable interface,class B does implement Cloneable interface.
when I try to clone an object of class A in class B it is very
allowing to be cloned which is a contradictary?Please go through the
example and suggest what is wrong ?
class A
int v = 100;
public Object Clone()
return new A();
class B extends A implements Cloneable
public static void main(String args[])
A a = new A();
A b = null;
b = (A)a.clone();
System.out.println("Value of v1 :" +a.v1);
System.out.println("Value of v1 :" +b.v1);
Thanks for your valuable help

Answer 1

According to the rule of cloning a object can be
cloned only if
it implements Cloneable interface ? In the following
example
class B extends class A which does not implement
Cloneable interface,class B does implement Cloneable
interface.
when I try to clone an object of class A in class B it
is very
allowing to be cloned which is a contradictary?Please
go through the
example and suggest what is wrong ?
class A
int v = 100;
public Object Clone()
return new A();
class B extends A implements Cloneable
public static void main(String args[])
A a = new A();
A b = null;
b = (A)a.clone();
System.out.println("Value of v1 :" +a.v1);
System.out.println("Value of v1 :" +b.v1);
Thanks for your valuable helpApart the fact that like that program cannot function, you didn't clone anything. You've just created another instance of class A!
Cloning means to create a copy of an existing object with aonother one having exact members (name, value, behaviour) like the first one!
Try to replace this piece of code:
A a = new A();
a.v = 500;
A b = null;
b = (A)a.clone();
System.out.println("Value of a.v :" +a.v);
System.out.println("Value of b.v :" +b.v);
and write "Clone" method like this: "clone". See that you'll obtain:
Value of a.v :500
Value of a.v :100
good luck!
m