Here you can find the source of isAssignableFrom(final Collection
public static boolean isAssignableFrom(final Collection<Class<?>> classes, final Class<?> objectClass)
//package com.java2s; /*/*from w ww.j a v a 2 s . co m*/ * Copyright 2004-2005 Revolution Systems Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Collection; public class Main { public static boolean isAssignableFrom(final Collection<Class<?>> classes, final Class<?> objectClass) { for (final Class<?> allowedClass : classes) { if (allowedClass != null) { if (allowedClass.isAssignableFrom(objectClass)) { return true; } } } return false; } public static boolean isAssignableFrom(final Collection<Class<?>> classes, final Object object) { Class<?> objectClass; if (object == null) { return false; } else if (object instanceof Class<?>) { objectClass = (Class<?>) object; } else { objectClass = object.getClass(); } return isAssignableFrom(classes, objectClass); } }