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I am quite comfortable with generics and such, but in this special case I have a question concerning the "Type safety: Unchecked cast from .. to .." warning. Basically I have a List of Class objects and now I want to get a subset of these that implement a special interface but the resulting List should also have that special Type: ... private List<Class<?>> classes; public List<Class<? extends Concrete>> getConcreteClasses() { List<Class<? extends Concrete>> concreteClasses = new LinkedList<Class<? extends Concrete>>(); for (Class<?> clazz: this.classes) { for (Class<?> i : clazz.getInterfaces()) { if (i.equals(Concrete.class)) { concreteClasses.add((Class<? extends Concrete>) clazz); } } } return concreteClasses; } The warning is of course related to the type cast: Type safety: Unchecked cast from Class<?> to Class<? extends Concrete> Can I get rid of the type cast or should I suppress the warning with @SuppressWarnings("unchecked")? Thanks for answers! PS: The environment is Java 6. Solution: Instead of concreteClasses.add((Class<? extends Concrete>) clazz); use concreteClasses.add(clazz.asSubclass(Concrete.class));

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