Java Collection Subset isSubset(final Collection<T> l1, final Collection<T> l2)

Description

Checks whether the first collection provided is a subset of the second collection provided.

License

Open Source License

Parameter

Parameter	Description
T	Type of the collections.
l1	First collection.
l2	Second collection.

Return

true if the first collection is a subset of the second (every item of the first is contained in the second), false otherwise.

Declaration

public static <T> boolean isSubset(final Collection<T> l1, final Collection<T> l2)

Method Source Code

//package com.java2s;
/*/*w  ww.  ja va2  s.co  m*/
 *  Copyright (C) 2010 vektor
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Collection;

public class Main {
    /**
     * Checks whether the first collection provided is a subset of the second
     * collection provided.
     *
     * @param <T> Type of the collections.
     * @param l1 First collection.
     * @param l2 Second collection.
     *
     * @return <code>true</code> if the first collection is a subset of the second
     *   (every item of the first is contained in the second), <code>false</code>
     *   otherwise.
     */
    public static <T> boolean isSubset(final Collection<T> l1, final Collection<T> l2) {
        return l2.containsAll(l1);
    }
}

Java Collection Subset isSubset(final Collection l1, final Collection l2)