Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2013 The Finnish National Board of Education - Opetushallitus
 *
 * This program is free software: Licensed under the EUPL, Version 1.1 or - as
 * soon as they will be approved by the European Commission - subsequent versions
 * of the EUPL (the "Licence");
 *
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at: http://www.osor.eu/eupl/
 *
 * 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
 * European Union Public Licence for more details.
 */

import java.util.*;

public class Main {
    /**
     * @param values1 to intersect with values2
     * @param values2 to intersect with values1
     * @param <T> type
     * @return the intersection of values1 and values2 with unique values ordered by values1
     */
    public static <T> List<T> intersection(Collection<T> values1, Collection<T> values2) {
        Set<T> added = new HashSet<T>(), set2 = new HashSet<T>(values2);
        List<T> results = new ArrayList<T>();
        for (T value : values1) {
            if (set2.contains(value) && !added.contains(value)) {
                results.add(value);
                added.add(value);
            }
        }
        return results;
    }
}