Java tutorial
//package com.java2s; /* * Copyright 2016 Red Hat, Inc. and/or its affiliates * and other contributors as indicated by the @author tags. * * 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 java.util.Collection; import java.util.Iterator; public class Main { public static String join(Collection<String> strings) { return join(strings, ", "); } public static String join(Collection<String> strings, String separator) { Iterator<String> iter = strings.iterator(); StringBuilder sb = new StringBuilder(); if (iter.hasNext()) { sb.append(iter.next()); while (iter.hasNext()) { sb.append(separator).append(iter.next()); } } return sb.toString(); } }