Here you can find the source of getAllTopicsAsString(final Collection
public static String getAllTopicsAsString(final Collection<String> topics)
//package com.java2s; /*********************************************************************************** * //from w w w .j a va 2 s .c o m * Copyright (c) 2014 Kamil Baczkowicz * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * and Eclipse Distribution License v1.0 which accompany this distribution. * * The Eclipse Public License is available at * http://www.eclipse.org/legal/epl-v10.html * * The Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * Contributors: * * Kamil Baczkowicz - initial API and implementation and/or initial documentation * */ import java.util.Collection; public class Main { public static String getAllTopicsAsString(final Collection<String> topics) { final StringBuffer messages = new StringBuffer(); for (final String topic : topics) { messages.append(topic); messages.append(System.lineSeparator()); } return messages.toString(); } }