class Declaration

[mahtab]

Please describe for me what's the meaning of this statement, I mean I dont understand <T extends A> in class declaration.

public abstract class B<T extends A>{
}

[pbrockway2]

It's explained in Sun's Tutorial in the section on Bounded Type Parameters. The discussion there centers around a method, but the idea is similar.

class B is generic. Like java.util.List where you can have List<String> for a list of strings and List<Number> for a list of numbers. In a similar way you can have B<Foo> for a B of Foo things. The point about extends is that Foo must extend A in order to be used in this way.