Returns the unique union of the given lists, for Collection<T> - Java java.util

Java examples for java.util:Collection to List

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Description

Returns the unique union of the given lists, for Collection<T>

Demo Code

/*******************************************************************************
 * Copyright (c) 2004, 2007 Boeing.//from   ww w. j  a va2s . co m
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
//package com.java2s;

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

import java.util.Set;

public class Main {
    public static void main(String[] argv) {
        Collection lists = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(setUnion(lists));
    }

    /**
     * Returns the unique union of the given lists
     */
    public static <T> Set<T> setUnion(Collection<T>... lists) {
        Set<T> union = new HashSet<T>(lists[0].size() * 2);

        for (int x = 0; x < lists.length; x++) {
            union.addAll(lists[x]);
        }
        return union;
    }
}

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