Here you can find the source of roundNumDecimals(double d, int num)
public static double roundNumDecimals(double d, int num)
//package com.java2s; /*/*from w ww . ja v a 2s . co m*/ * Copyright (C) 2012 t7seven7t * BangL <henno.rickowski@googlemail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.text.DecimalFormat; public class Main { public static double roundNumDecimals(double d, int num) { StringBuilder format = new StringBuilder("#."); for (int i = 0; i < num; i++) { format.append("#"); } DecimalFormat f = new DecimalFormat(format.toString()); return Double.valueOf(f.format(d)); } }