Here you can find the source of getDocumentBuilder()
private static DocumentBuilder getDocumentBuilder()
//package com.java2s; /*//www.j av a2 s. c om * Copyright (C) 2009 Teleca Poland Sp. z o.o. <android@teleca.com> * * 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. */ import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; public class Main { /** * singleton */ private static DocumentBuilderFactory documentBuilderFactory = null; /** * DocumentBuilder instance * * @return */ private static DocumentBuilder getDocumentBuilder() { try { return getDocumentBuilderFactory().newDocumentBuilder(); } catch (ParserConfigurationException e) { return null; } } /** * DocumentBuilderFactory instance (lazy initialization) * * @return */ private static DocumentBuilderFactory getDocumentBuilderFactory() { if (documentBuilderFactory == null) { documentBuilderFactory = DocumentBuilderFactory.newInstance(); } return documentBuilderFactory; } }