Here you can find the source of concatValues(List
public static String concatValues(List<String> stringValues, boolean spaceSeparated)
//package com.java2s; /*//from w w w . j a v a 2 s . c om * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. licenses this file to you 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 java.util.List; public class Main { public static String concatValues(List<String> stringValues, boolean spaceSeparated) { StringBuilder builder = new StringBuilder(); String separator = spaceSeparated ? " " : ", "; for (int x = 0; x < stringValues.size(); ++x) { builder.append(stringValues.get(x)); if (x != stringValues.size() - 1) { builder.append(separator); } } return builder.toString(); } }