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I am writing some classes using Generics but I can't find a solution for the class SolutionsSubset and so I a getting the error "type parameter S is not within its bound". I have read previous questions about the same error but I can't solve it for my case. Could anybody help me to improve my knowledge about generics? Any reference to a good book (I can find in google a lot of information but if someone can reccommend a book, tutorial, etc. will be welcome). Although I tried to keep in mind the rules to ask a question but I apologize if my question doesn't fulfill these rules. I have the following classes and interfaces: public interface Subset<T extends Comparable<T>> extends Comparable<Subset<T>> public class MathSubset<T extends Comparable<T>> extends TreeSet<T> implements Subset<T> public interface Solution<T extends Comparable<T>> public interface Solutions<S extends Solution<?>> extends Iterable<S> public class SolutionsSubset<S extends Solution<?>> extends MathSubset<S> implements Solutions<S> I need that Subset extends Comparable. In SolutionsSubset, the class MathSubset stores Solution objects. How do I have to change these definition to make it work? Thanks you in advance

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