Java tutorial
//package com.java2s; /* * @(#)ModelStringUtil.java * * Copyright (C) 2006-2011 www.interpss.com * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE * as published by the Free Software Foundation; either version 2.1 * 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. * * @Author Mike Zhou * @Version 1.0 * @Date 02/15/2008 * * Revision History * ================ * */ public class Main { /** * convert charters [beginCol, endCol] of the input string to a double. Return 0.0 number if empty. * * @param str input string * @param beginCol begin column, starts from 1 ... * @param endCol end column * @return the number */ public static double getDouble(String str, int beginCol, int endCol) { if (str.length() < endCol) return 0.0; String s = str.substring(beginCol - 1, endCol); if (s.trim().equals("")) return 0.0; else return new Double(s.trim()).doubleValue(); } /** * convert str to a double. Return defaultValue number if empty. * * @param str input string * @return the number */ public static double getDouble(String str, double defaultValue) { try { return new Double(str.trim()).doubleValue(); } catch (Exception e) { return defaultValue; } } }