Here you can find the source of convertToString(Collection> ss)
public static String convertToString(Collection<?> ss)
//package com.java2s; /*/*from ww w .j ava 2 s . c o m*/ * Xapp (pronounced Zap!), A automatic gui tool for Java. * Copyright (C) 2009 David Webber. All Rights Reserved. * * The contents of this file may be used under the terms of the GNU Lesser * General Public License Version 2.1 or later. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. */ import java.util.*; public class Main { public static String convertToString(Collection<?> ss) { StringBuilder sb = new StringBuilder(); for (Object i : ss) { sb.append(i).append(','); } return sb.toString(); } }