Java List Add Unique addUniqueValues(List source, List target)

Description

Adds values from the source list to the target list only if they don't already exist in the target

License

Apache License

Parameter

Parameter	Description
source	the list to add items from
target	the list to add items to
T	the type of the source & target lists

Declaration

public static <T> void addUniqueValues(List<T> source, List<T> target) 

Method Source Code

//package com.java2s;
/*/*from w  w  w . j  a  v  a2  s  .c  o  m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.List;

public class Main {
    /**
     * Adds values from the source list to the target list only if they don't already exist in the target
     * @param source the list to add items from
     * @param target the list to add items to
     * @param <T>  the type of the source & target lists
     */
    public static <T> void addUniqueValues(List<T> source, List<T> target) {
        for (T item : source) {
            if (!target.contains(item)) {
                target.add(item);
            }
        }
    }
}

Related

1. addUnique(List aList, T anObj)
2. addUnique(List list, T item)
3. addUnique(List list, T item)
4. addUniqueId(List aList, T anObj)
5. addUniqueItems(List from, List to)