Here you can find the source of minus(Integer a, Integer b)
public static Integer minus(Integer a, Integer b)
//package com.java2s; /**//w ww. java2s. co m * PureInfo Force * @(#)NumberUtil.java 1.0 Oct 23, 2005 * * Copyright(c) 2004-2005, PureInfo Information Technology Corp. Ltd. * All rights reserved, see the license file. * * www.pureinfo.com.cn */ public class Main { public static Integer minus(Integer a, Integer b) { return new Integer(a.intValue() - b.intValue()); } public static Long minus(Long a, Long b) { return new Long(a.longValue() - b.longValue()); } public static Short minus(Short a, Short b) { return new Short((short) (a.shortValue() - b.shortValue())); } }