Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.*; public class Main { private static Map<Class<?>, Class<?>> getWrapperTypes() { Map<Class<?>, Class<?>> ret = new HashMap<Class<?>, Class<?>>(); ret.put(Boolean.TYPE, Boolean.class); ret.put(Character.TYPE, Character.class); ret.put(Byte.TYPE, Byte.class); ret.put(Short.TYPE, Short.class); ret.put(Integer.TYPE, Integer.class); ret.put(Long.TYPE, Long.class); ret.put(Float.TYPE, Float.class); ret.put(Double.TYPE, Double.class); ret.put(Void.TYPE, Void.class); return ret; } }