Java tutorial
//package com.java2s; /* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved. * This code is licensed under the GPL 2.0 license, availible at the root * application directory. */ import java.math.BigInteger; public class Main { /** * @param value A number * * @return The number as a {@link BigInteger}. */ public static BigInteger asBigInteger(Number number) { if (number == null) { return null; } if (number instanceof BigInteger) { return (BigInteger) number; } return BigInteger.valueOf(number.longValue()); } }