Java tutorial
//package com.java2s; import java.util.HashSet; import java.util.Set; public class Main { private static Set<Class<?>> getWrapperTypes() { Set<Class<?>> ret = new HashSet<Class<?>>(); ret.add(Boolean.class); ret.add(Character.class); ret.add(Byte.class); ret.add(Short.class); ret.add(Integer.class); ret.add(Long.class); ret.add(Float.class); ret.add(Double.class); ret.add(Void.class); ret.add(String.class); return ret; } }