Get Super Interfaces

 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ClassUtil {

    public static Class[] getSuperInterfaces(Class[] childInterfaces) {

        List allInterfaces = new ArrayList();

        for (int i = 0; i < childInterfaces.length; i++) {
            allInterfaces.add(childInterfaces[i]);
            allInterfaces.addAll(
                Arrays.asList(
                    getSuperInterfaces(childInterfaces[i].getInterfaces())));
        }

        return (Class[]) allInterfaces.toArray(new Class[allInterfaces.size()]);
    }

    /**
     * Builds an <b>unordered</b> set of all interface and object classes that
     * are generalizations of the provided class.
     * @param classObject the class to find generalization of.
     * @return a Set of class objects.
     */
    public static Set getGeneralizations(Class classObject) {
        Set generalizations = new HashSet();

        generalizations.add(classObject);

        Class superClass = classObject.getSuperclass();
        if (superClass != null) {
            generalizations.addAll(getGeneralizations(superClass));
        }

        Class[] superInterfaces = classObject.getInterfaces();
        for (int i = 0; i < superInterfaces.length; i++) {
            Class superInterface = superInterfaces[i];
            generalizations.addAll(getGeneralizations(superInterface));
        }

        return generalizations;
    }

}