Java List Prepend prependToList(A elem, List list)

License

Declaration

public static <A> List<A> prependToList(A elem, List<A> list) 

Method Source Code

//package com.java2s;
/*/*w w  w.j  av a 2  s  . com*/
 * Copyright (c) 2016 Catavolt Inc. All rights reserved.
 *
 * This file is part of Ozy.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero 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 {
    /**
     * Return a new list with element prepended to previous list.
     */
    public static <A> List<A> prependToList(A elem, List<A> list) {
        List<A> answer = new ArrayList<A>(list.size() + 1);
        answer.add(elem);
        answer.addAll(list);
        return answer;
    }
}

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