Here you can find the source of createMap(U... items)
public static <U> Map<U, U> createMap(U... items)
//package com.java2s; /*/*from w w w . j a va 2s. c om*/ * Copyright (C) 2008 Universidade Federal de Campina Grande * * This file is part of Commune. * * Commune is free software: you can redistribute it and/or modify it under the * terms of the GNU Lesser 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 Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ import java.util.HashMap; import java.util.Map; public class Main { public static <U> Map<U, U> createMap(U... items) { Map<U, U> result = new HashMap<U, U>(); for (U item : items) { result.put(item, item); } return result; } }