Here you can find the source of concatenate(List
public static List<Object> concatenate(List<Object> list1, List<Object> list2)
//package com.java2s; /*/* www. j av a 2 s . c o m*/ * Copyright (C) 2016 Arun Kumar Selvaraj * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> */ import java.util.ArrayList; import java.util.List; public class Main { public static List<Object> concatenate(List<Object> list1, List<Object> list2) { List<Object> returnList = new ArrayList(); if (list1.size() == 0) { return list2; } else if (list2.size() == 0) { return list1; } else if ((list1.size() > 1 && list2.size() > 1 && list1.size() != list2.size())) { returnList.add(list1.get(0).toString() + list2.get(0).toString()); } else if (list1.size() == list2.size()) { for (int i = 0; i < list1.size(); i++) { returnList.add(list1.get(i).toString() + list2.get(i).toString()); } } else if (list1.size() == 1 && list2.size() > 1) { for (int i = 0; i < list2.size(); i++) { returnList.add(list1.get(0).toString() + list2.get(i).toString()); } } else if (list1.size() > 1 && list2.size() == 1) { for (int i = 0; i < list1.size(); i++) { returnList.add(list1.get(i).toString() + list2.get(0).toString()); } } return returnList; } }