Doubt related to casting

[Dash Abhisek]

public class Foo  extends boo
{
 
public static void main(String[] args) {
boo bObject = new Foo();
Foo fObject= new Foo();
boo bObject1=(boo)fObject;//line of confusion
bObject1.abc();//prints in Fooo//
}
void abc()
{
System.out.println("in Fooo");
}

}

class boo{
void abc()
{
System.out.println("in booo");
}
}

I am not able to understand that bObject1 is of type boo and it contains a new Foo() which is upcasted to boo and when we call b0bject1.abc()--it is printing the line depending upon what object the reference variable bobject1
has in it...,compiler doesn't take into account the casting....but if i send
a new Integer(5) to a method expecting an Object as argument...,I have to downcast and get the Integer object...to be able to call Integer specific methods and if I don't downcast I can only access Object specific methods,so, my question is in this example
when Iam upcasting it (please refer line of confusion above) and then call bObject1.abc () why not it is printing "in boo" (that is boo specific method)


Thanks

[edit]Add code tags. CR[/edit]
[ August 02, 2008: Message edited by: Campbell Ritchie ]

[Jigar Gandhi]

hello friend
i understood your doubt ;
Since the methods are overridden the compiler chooses the method specfic to the object being created and not the reference type
when we upcast the reference it is still referring the Foo object and not a boo object. i hope you have understood else please refer to kathy sierra's book for scjp preparation

[Dash Abhisek]

Thanks for the reply...,it helped