Here you can find the source of collectionToString(Collection
public static String collectionToString(Collection<Object> collection)
//package com.java2s; /**//w w w . j a v a 2 s . co m * VMware Continuent Tungsten Replicator * Copyright (C) 2015 VMware, Inc. All rights reserved. * * 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. * * Initial developer(s): Edward Archibald * Contributor(s): */ import java.util.Collection; public class Main { public static String collectionToString(Collection<Object> collection) { StringBuilder builder = new StringBuilder(); for (Object obj : collection) { builder.append(String.format("%s\n", obj.toString())); } return builder.toString(); } }