Here you can find the source of quote(String s)
public static String quote(String s)
//package com.java2s; /******************************************************************************* * Copyright 2014 United States Government as represented by the * Administrator of the National Aeronautics and Space Administration. * All Rights Reserved./*w w w .j ava 2 s .c o m*/ * * 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. ******************************************************************************/ public class Main { private static final char DOUBLE_QUOTE = '"'; private static final String UNESCAPED_DOUBLE_QUOTE = Character.toString(DOUBLE_QUOTE); private static final String ESCAPED_DOUBLE_QUOTE = UNESCAPED_DOUBLE_QUOTE + UNESCAPED_DOUBLE_QUOTE; public static String quote(String s) { return DOUBLE_QUOTE + s.replaceAll(UNESCAPED_DOUBLE_QUOTE, ESCAPED_DOUBLE_QUOTE) + DOUBLE_QUOTE; } }