Here you can find the source of isPrimitiveOrWrapper(Class> type)
private static boolean isPrimitiveOrWrapper(Class<?> type)
//package com.java2s; /* /*from w w w .j a v a 2 s .c o m*/ * Copyright 2015 Eduardo Ramos. * * 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.HashMap; import java.util.Map; public class Main { private static final Map<Class<?>, Class<?>> PRIMITIVES_TO_WRAPPERS = new HashMap<>(); private static boolean isPrimitiveOrWrapper(Class<?> type) { return isPrimitive(type) || isWrapper(type); } private static boolean isPrimitive(Class<?> type) { return PRIMITIVES_TO_WRAPPERS.containsKey(type); } private static boolean isWrapper(Class<?> type) { return PRIMITIVES_TO_WRAPPERS.containsValue(type); } }