Java tutorial
//package com.java2s; /* * This file is part of McIDAS-V * * Copyright 2007-2015 * Space Science and Engineering Center (SSEC) * University of Wisconsin - Madison * 1225 W. Dayton Street, Madison, WI 53706, USA * http://www.ssec.wisc.edu/mcidas * * All Rights Reserved * * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and * some McIDAS-V source code is based on IDV and VisAD source code. * * McIDAS-V is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * McIDAS-V 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 Public License for more details. * * You should have received a copy of the GNU Lesser Public License * along with this program. If not, see http://www.gnu.org/licenses. */ import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; public class Main { /** * Creates a {@link List} from incoming {@literal "varargs"}. Currently * uses {@link ArrayList} as the {@code List} implementation. * * <p>Used like so: * {@code List<String> listy = list("y", "helo", "thar");} * * @param elements Items that will make up the elements of the returned * {@code List}. * * @return A {@code List} whose elements are each item within {@code elements}. */ public static <E> List<E> list(E... elements) { List<E> newList = arrList(elements.length); Collections.addAll(newList, elements); return newList; } /** * Creates an empty {@link ArrayList} that uses a little cleverness with * Java's generics. Useful for eliminating redundant type information and * declaring fields as {@code final}. * * <p>Used like so: * {@code List<String> listy = arrList();} * * <p>Please consider using {@link #arrList(int)} or * {@link #arrList(java.util.Collection)} instead of this method. * * @return A new, empty {@code ArrayList}. * * @see #arrList(int) * @see #arrList(java.util.Collection) */ @SuppressWarnings({ "CollectionWithoutInitialCapacity" }) public static <E> List<E> arrList() { return new ArrayList<>(); } /** * Creates an empty {@link ArrayList} with a given capacity. * * @param capacity The initial size of the returned {@code ArrayList}. * * @return A new, empty {@code ArrayList} that has an initial capacity of * {@code capacity} elements. * * @see ArrayList#ArrayList(int) */ public static <E> List<E> arrList(final int capacity) { return new ArrayList<>(capacity); } /** * Copies an existing {@link Collection} into a new {@link ArrayList}. * * @param c {@code Collection} whose elements are to be placed into the * returned {@code ArrayList}. * * @return An {@code ArrayList} containing the elements of {@code c}. * * @see ArrayList#ArrayList(Collection) */ public static <E> List<E> arrList(final Collection<? extends E> c) { return new ArrayList<>(c); } }