Here you can find the source of round(BigDecimal what, int howmuch)
public static BigDecimal round(BigDecimal what, int howmuch)
//package com.java2s; /*/*from w w w .j av a 2s .co m*/ * (C) Copyright 2009-2013 Manaty SARL (http://manaty.net/) and contributors. * * Licensed under the GNU Public Licence, 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.gnu.org/licenses/gpl-2.0.txt * * 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 { public static BigDecimal round(BigDecimal what, int howmuch) { if (what == null) { return null; } double number = Double.parseDouble(what.toString()); double formatedNumber = (double) ((int) (number * Math.pow(10, howmuch) + .5)) / Math.pow(10, howmuch); return BigDecimal.valueOf(formatedNumber); } }