Set Union, Gets a Set containing all of the entries from the sets provided. - Java Collection Framework

Java examples for Collection Framework:Set

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Description

Set Union, Gets a Set containing all of the entries from the sets provided.

Demo Code

/*// www.  j  a va 2 s  .c  o  m
 * Copyright Terracotta, Inc.
 *
 * 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.
 */
//package com.java2s;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

public class Main {
    public static void main(String[] argv) throws Exception {
        List sets = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(unionSets(sets));
    }

    /**
     * Gets a {@code Set} containing all of the entries from the sets provided.
     *
     * @param sets the {@code Set} instances to combine
     *
     * @return a new {@code Set} containing all of the elements
     */
    private static Set<String> unionSets(final List<Set<String>> sets) {
        final Set<String> union = new HashSet<String>();
        for (final Set<String> set : sets) {
            union.addAll(set);
        }
        return union;
    }
}

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