Use interface in private method signature

Author: garydgregory

src/main/java/org/apache/commons/lang3/ClassUtils.java

@@ -383,7 +383,7 @@ public static List<Class<?>> getAllInterfaces(final Class<?> cls) {
      * @param cls the class to look up, may be {@code null}.
      * @param interfacesFound the {@link Set} of interfaces for the class.
      */
-    private static void getAllInterfaces(Class<?> cls, final HashSet<Class<?>> interfacesFound) {
+    private static void getAllInterfaces(Class<?> cls, final Set<Class<?>> interfacesFound) {
         while (cls != null) {
             for (final Class<?> i : cls.getInterfaces()) {
                 if (interfacesFound.add(i)) {