Here you can find the source of toDouble(Object x)
private static Double toDouble(Object x) throws NumberFormatException
//package com.java2s; /******************************************************************************* * Copyright (c) 2012 GigaSpaces Technologies Ltd. All rights reserved * * Licensed under the Apache License, 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.apache.org/licenses/LICENSE-2.0 * * 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./* w w w . j av a 2s. c o m*/ *******************************************************************************/ public class Main { private static Double toDouble(Object x) throws NumberFormatException { if (x instanceof Number) { return ((Number) x).doubleValue(); } return Double.valueOf(x.toString()); } }