Java List Difference difference(List firstList, List secondList)

Description

Returns the set difference of the given lists.

License

Open Source License

Parameter

Parameter	Description
firstList	The list to be subtracted from.
secondList	The list subtracted from the first list.
E	The component type of the lists.

Return

The set difference of the two lists.

Declaration

public static <E> List<E> difference(List<E> firstList, List<E> secondList) 

Method Source Code

//package com.java2s;
/*/*from  ww w . j a  v a  2  s . c o m*/
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Lachlan Dowding
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import java.util.ArrayList;

import java.util.List;

public class Main {
    /**
     * Returns the set difference of the given lists.
     *
     * @param firstList     The list to be subtracted from.
     * @param secondList    The list subtracted from the first list.
     * @param <E>           The component type of the lists.
     * @return              The set difference of the two lists.
     */
    public static <E> List<E> difference(List<E> firstList, List<E> secondList) {
        List<E> results = create();

        if (firstList != null)
            results.addAll(firstList);
        if (secondList != null)
            results.removeAll(secondList);

        return results;
    }

    /**
     * Creates a new list.
     *
     * @param <E>             The component type of the list.
     * @return                A new list.
     */
    public static <E> List<E> create() {
        return new ArrayList<E>();
    }

    /**
     * Creates a new list with the given initial capacity.
     *
     * @param initialCapacity The initial capacity of the new list.
     * @param <E>             The component type of the list.
     * @return                A new list.
     */
    public static <E> List<E> create(int initialCapacity) {
        return new ArrayList<E>(initialCapacity);
    }
}

Related

1. diff(List doublesA, List doublesB)
2. diffAsSet(Collection list1, Collection list2)
3. difference(final List minuend, final List subtrahend)
4. difference(final List list1, final List list2)
5. difference(final String[] list1, final String[] list2)
6. difference(List lst1, List lst2)
7. difference(List set1, List set2)
8. differenceOfList(List a, List b)
9. differentCategory(String prop1, String prop2, List cat1, List cat2)