Here you can find the source of isNumeralType(final Class> c)
public static boolean isNumeralType(final Class<?> c)
//package com.java2s; //License from project: Open Source License import java.util.*; public class Main { final static private ArrayList<Class<?>> NumeralTypes = new ArrayList<>(); public static boolean isNumeralType(final Class<?> c) { return NumeralTypes.contains(c); }// w w w. j a v a 2s .co m }