Here you can find the source of add(Number a, Number b)
private static Number add(Number a, Number b)
//package com.java2s; /*/* w w w. j a va 2s . co m*/ * Copyright 1999-2011 Alibaba Group Holding Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.math.BigDecimal; public class Main { private static Number add(Number a, Number b) { if (a instanceof BigDecimal) { return ((BigDecimal) a).add(new BigDecimal(b.toString())); } return a.longValue() + b.longValue(); } }