Here you can find the source of appendToCollection(Collection
public static Collection<String> appendToCollection(Collection<String> col, String str)
//package com.java2s; /*//from w ww . j a va 2 s . c om * 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 Collection<String> appendToCollection(Collection<String> col, String str) { if (str != null && !str.isEmpty()) { Collections.addAll(col, str.split(",")); } return col; } }