Java tutorial
//package com.java2s; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 { /** * Maps primitive <code>Class</code>es to their corresponding wrapper <code>Class</code>. */ private static final Map primitiveWrapperMap = new HashMap(); /** * <p>Converts the specified primitive Class object to its corresponding * wrapper Class object.</p> * * <p>NOTE: From v2.2, this method handles <code>Void.TYPE</code>, * returning <code>Void.TYPE</code>.</p> * * @param cls the class to convert, may be null * @return the wrapper class for <code>cls</code> or <code>cls</code> if * <code>cls</code> is not a primitive. <code>null</code> if null input. * @since 2.1 */ public static Class primitiveToWrapper(Class cls) { Class convertedClass = cls; if (cls != null && cls.isPrimitive()) { convertedClass = (Class) primitiveWrapperMap.get(cls); } return convertedClass; } }