Java Collection Subset isSubset(Collection subset, Collection superset)

Description

is Subset

License

Apache License

Declaration

public static <T> boolean isSubset(Collection<T> subset, Collection<T> superset) 

Method Source Code

//package com.java2s;
/**//from  w  w w .  jav a  2s.  c  o  m
 * Copyright 2010-present Facebook.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.*;

public class Main {
    public static <T> boolean isSubset(Collection<T> subset, Collection<T> superset) {
        if ((superset == null) || (superset.size() == 0)) {
            return ((subset == null) || (subset.size() == 0));
        }

        HashSet<T> hash = new HashSet<T>(superset);
        for (T t : subset) {
            if (!hash.contains(t)) {
                return false;
            }
        }
        return true;
    }
}

Related

1. isSubset(Collection subset, Collection of)
2. isSubset(Collection subSet, Collection superSet)
3. isSubset(Collection s1, Collection s2)
4. isSubset(final Collection l1, final Collection l2)
5. sub(Collection list, int start, int end)