Java tutorial
//package com.java2s; /** * Copyright 2000-2006 DFKI GmbH. * All Rights Reserved. Use is subject to license terms. * <p/> * This file is part of MARY TTS. * <p/> * MARY TTS 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, version 3 of the License. * <p/> * 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 Lesser General Public License for more details. * <p/> * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { /** * For a string containing a semitones delta as judged by * <code>isSemitonesDelta()</code>, return the numerical value, as a * double. * * @return the numeric part of the semitones delta, or 0 * if the string is not a valid semitones delta. */ public static double getSemitonesDelta(String string) { String s = string.trim(); if (!isSemitonesDelta(s)) return 0; String num = s.substring(0, s.length() - 2); double value = 0; try { value = Double.parseDouble(num); } catch (NumberFormatException e) { //logger.warn("Unexpected number value `" + num + "'"); } return value; } /** * Tell whether the string contains a positive or negative semitones delta, * i.e., a semitones number with an obligatory + or - sign, such as * "+3.2st" or "-13.2st". */ public static boolean isSemitonesDelta(String string) { String s = string.trim(); if (s.length() < 4) return false; return s.substring(s.length() - 2).equals("st") && isNumberDelta(s.substring(0, s.length() - 2)); } /** * Tell whether the string contains a positive or negative number * delta, i.e., a number with an obligatory + or - sign. */ public static boolean isNumberDelta(String string) { String s = string.trim(); if (s.length() < 2) return false; return (s.charAt(0) == '+' || s.charAt(0) == '-') && isUnsignedNumber(s.substring(1)); } /** * Tell whether the string contains an unsigned number. */ public static boolean isUnsignedNumber(String string) { String s = string.trim(); if (s.length() < 1) return false; if (s.charAt(0) != '+' && s.charAt(0) != '-') { double value = 0; try { value = Double.parseDouble(s); } catch (NumberFormatException e) { return false; } return true; } return false; } }