Here you can find the source of toDouble(Object value, double nullValue)
public static double toDouble(Object value, double nullValue)
//package com.java2s; /*// ww w. j a va 2 s . c o m * This file is part of the Jose Project * see http://jose-chess.sourceforge.net/ * (c) 2002-2006 Peter Sch?fer * * 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 2 of the License, or * (at your option) any later version. * */ public class Main { public static double toDouble(Object value, double nullValue) { if (value == null) return nullValue; if (value instanceof Number) return ((Number) value).doubleValue(); else return Double.parseDouble(value.toString()); } }