Main.java Source code

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//package com.java2s;
/*
 * Copyright 2015-2018 52North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * 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.Collection;

import java.util.HashSet;

import java.util.Set;

import java.util.stream.Collectors;

public class Main {
    public static <T> Set<T> conjunctCollectionsToSet(Collection<T> list1, Collection<T> list2) {
        Set<T> set = new HashSet<>(list2);
        return list1.stream().filter(set::contains).collect(Collectors.toSet());
    }
}