Get all interface and object classes that are generalizations of the provided class : Interface « Reflection « Java Tutorial

 * The contents of this file are subject to the Sapient Public License
 * Version 1.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * The Original Code is The Carbon Component Framework.
 * The Initial Developer of the Original Code is Sapient Corporation
 * Copyright (C) 2003 Sapient Corporation. All Rights Reserved.

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

 * Copyright 2003 Sapient
 * @since carbon 2.0
 * @author Greg Hinkle, March 2003
 * @version $Revision: 1.5 $($Author: dvoet $ / $Date: 2003/05/05 21:21:23 $)
public class ClassUtil {

     * Retrieves all interfaces implemented by a specified interface
     * including all recursively extended interfaces and the classes supplied
     * int the parameter.
     * @param childInterfaces a set of interfaces
     * @return Class[] an array of interfaces that includes those specifed
     * in childInterfaces plus all of those interfaces' super interfaces
    public static Class[] getSuperInterfaces(Class[] childInterfaces) {

        List allInterfaces = new ArrayList();

        for (int i = 0; i < childInterfaces.length; i++) {

        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();


        Class superClass = classObject.getSuperclass();
        if (superClass != null) {

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

        return generalizations;


7.2.1.The superclass of interfaces is always null
7.2.2.Listing the Interfaces That an Interface Extends
7.2.3.Checking whether String is an interface or class
7.2.4.If a class object is an interface or a class
7.2.5.Listing the Interfaces That a Class Implements
7.2.6.Although the type of o2 is an interface, getSuperclass() returns the object's superclass
7.2.7.The interfaces for a primitive type is an empty array
7.2.8.Return Returns true if type is implementing Map
7.2.9.Returns true if a class implements Serializable and false otherwise.
7.2.10.Get Super Interfaces
7.2.11.Get all interface and object classes that are generalizations of the provided class