Question with generics

[kartik krishnan]

Hi I am learning generics and I hope that this is not a silly question.

If I have an interface Foo<T>, having one method T getById(int id) whose implementation I defined in a file, which has two Java Classes. The implementation of Foo<T> is not public class but with default access scope.

   
 
public interface Foo<T> {
 T getById(int id);
}
 

In AnotherClass.java, I have

  
 
public class AnotherClass {
.........
}
 

and

  
class FooImpl implements Foo<User> {
   public User getById(int id) {
   }
}

I have two questions,

1) When I try to use the statement

class FooImpl<User> implements Foo<User> {
....
}

I get an error "Can not object of type User". I would like to to know why

2) When I try to use the implementation reference in AnotherClass, I have to specifically cast it .To show an example

   
Foo<User> foo = (Foo<User>)  new FooImpl();
 

which in turn throws a warning. is there a way by which I can remove the warnings and not suppress them.

Thanks for your help

[ Corrected closing code tag and disabled smilies. -ds ]
[ February 04, 2008: Message edited by: Dirk Schreckmann ]