Java List Difference diffAsSet(Collection list1, Collection list2)

Description

Returns all objects in list1 that are not in list2.

License

Open Source License

Parameter

Parameter	Description
T	Type of items in the collection
list1	First collection
list2	Second collection

Return

The collection difference list1 - list2

Declaration

public static <T> Set<T> diffAsSet(Collection<T> list1, Collection<T> list2) 

Method Source Code

//package com.java2s;

import java.util.*;

public class Main {
    /**//w w w  .  jav a  2 s  .  c om
     * Returns all objects in list1 that are not in list2.
     *
     * @param <T> Type of items in the collection
     * @param list1 First collection
     * @param list2 Second collection
     * @return The collection difference list1 - list2
     */
    public static <T> Set<T> diffAsSet(Collection<T> list1, Collection<T> list2) {
        Set<T> diff = new HashSet<>();
        for (T t : list1) {
            if (!list2.contains(t)) {
                diff.add(t);
            }
        }
        return diff;
    }
}

Related

1. diff(List ls, List ls2)
2. diff(List doublesA, List doublesB)
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 firstList, List secondList)