Why is the extends constraint necessary?

843793

I'm sure there is a good reason, but why is the extends constraint necessary in the generics spec? For example:

public class Foo <E extends Bar>

instead of

public class Foo <Bar>

It seems to me that proper design would usually dictate that Bar be an abstract class or interface in this instance anyway, so the extends constraint should be implicit. I am new to Java generics but have some experience with templates in C++. What am I missing here?

843793

DOH! Now I see it. Never mind...