Here you can find the source of copy(List src, boolean immutable)
public static <T> List<T> copy(List<? extends T> src, boolean immutable)
//package com.java2s; /******************************************************************************* * This file is part of the Polyglot extensible compiler framework. * * Copyright (c) 2000-2012 Polyglot project group, Cornell University * Copyright (c) 2006-2012 IBM Corporation * All rights reserved./*w w w.j a va2s .co m*/ * * This program and the accompanying materials are made available under * the terms of the Eclipse Public License v1.0 which accompanies this * distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * This program and the accompanying materials are made available under * the terms of the Lesser GNU Public License v2.0 which accompanies this * distribution. * * The development of the Polyglot project has been supported by a * number of funding sources, including DARPA Contract F30602-99-1-0533, * monitored by USAF Rome Laboratory, ONR Grants N00014-01-1-0968 and * N00014-09-1-0652, NSF Grants CNS-0208642, CNS-0430161, CCF-0133302, * and CCF-1054172, AFRL Contract FA8650-10-C-7022, an Alfred P. Sloan * Research Fellowship, and an Intel Research Ph.D. Fellowship. * * See README for contributors. ******************************************************************************/ import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Main { public static <T> List<T> copy(List<? extends T> src, boolean immutable) { if (src == null) return null; List<T> result = new ArrayList<>(src); if (immutable) return Collections.unmodifiableList(result); return result; } }