Java List Intersect intersection(final List list1, final List list2)

Description

Returns a new list containing all elements that are contained in both given lists.

License

Apache License

Parameter

Parameter	Description
list1	the first list
list2	the second list

Exception

Parameter	Description
NullPointerException	if either list is null

Return

the intersection of those two lists

Declaration

public static List intersection(final List list1, final List list2) 

Method Source Code

//package com.java2s;
/*//  www. jav a 2s  .  c o  m
 *  Copyright 2001-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import java.util.ArrayList;

import java.util.Iterator;
import java.util.List;

public class Main {
    /**
     * Returns a new list containing all elements that are contained in
     * both given lists.
     *
     * @param list1  the first list
     * @param list2  the second list
     * @return  the intersection of those two lists
     * @throws NullPointerException if either list is null
     */
    public static List intersection(final List list1, final List list2) {
        final ArrayList result = new ArrayList();
        final Iterator iterator = list2.iterator();

        while (iterator.hasNext()) {
            final Object o = iterator.next();

            if (list1.contains(o)) {
                result.add(o);
            }
        }

        return result;
    }
}

Related

1. intersect(List in1, List in2)
2. intersect(Set a, List b)
3. intersect2orderedList(List s1, List s2)
4. intersectAll(final List collector, final T[] a, final T[] b)
5. intersectDate(List oDate, List tDate)
6. intersection(final List list1, final List list2)
7. intersection(final List list1, final List list2)
8. intersection(List> sets)
9. intersection(List list1, List list2)