Here you can find the source of copy(List extends T> src, int offset, int length)
public static <T> List<T> copy(List<? extends T> src, int offset, int length)
//package com.java2s; /*/*from w w w.j a va2s . c om*/ * (c) Copyright 2007-2011 by Volker Bergmann. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, is permitted under the terms of the * GNU General Public License. * * For redistributing this software or a derivative work under a license other * than the GPL-compatible Free Software License as defined by the Free * Software Foundation or approved by OSI, you must first obtain a commercial * license to this software product from Volker Bergmann. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS, * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ import java.util.*; public class Main { public static <T> List<T> copy(List<? extends T> src, int offset, int length) { List<T> items = new ArrayList<T>(length); for (int i = 0; i < length; i++) items.add(src.get(offset + i)); return items; } /** * Adds the content of an array to a collection * @param target the collection to be extended * @param values the values to add */ public static <T, U extends T, C extends Collection<? super T>> C add(C target, U... values) { for (T item : values) target.add(item); return target; } }