Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/* ============== HelperTools ==============
 * Initial developer: Lukas Diener <lukas.diener@hotmail.com>
 *
 * =====
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE - Version 2
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 * TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 * 0. You just DO WHAT THE FUCK YOU WANT TO.
 *
 * =====
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
 *
 */

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

public class Main {
    /**
     * This method performs a union on two collections of elements as per definition of the <i>union</i> operation in set theory. 
     * The resulting collection guarantees unique membership as per implementation of the Java {@link java.util.Set} interface.
     * This is a null-safe operation.
     * @see <a href="http://en.wikipedia.org/wiki/Union_(set_theory)">Union (set theory)</a>
     * @param firstGroup Collection to be used.
     * @param secondGroup Collection to be used.
     * @return The resulting collection containing all distinct members from the two groups.
     */
    public static <T> Collection<T> union(Collection<T> firstGroup, Collection<T> secondGroup) {

        if (firstGroup == null)
            return secondGroup;
        else if (secondGroup == null)
            return firstGroup;
        else {
            Set<T> firstSet = new HashSet<T>(firstGroup);
            firstSet.addAll(secondGroup);
            return firstSet;
        }
    }
}