I'm starting to use the features of 1.5 and wondering why the following
isn't enforced by the compiler:  I haven't been able to find an answer,
or alternative way of doing it:
I'm jusing JDK 1.5.0_7

If I declare a that a collection is of type Integer in an interface
such as:

public interface MyInterface {
   public void doSomething(Collection<Integer> collection);
}

Why doesn't it complain if it is excluded from the implementing class?

public class MyClass implements MyInterface {
   public void doSomething(Collection collection) {
   collection.add(new String());
   }
}

I would expect one of 2 compiler errors:
1. MyClass doesn't implement the interface correctly since the method
signatures are different.
2. String can't be added to collection of Integer.

I suspect it has to do with the rewrite from 'erasure' to remove
generics,
but is this a compiler bug, or should I be doing it a different way?

Thanks,
-CEC