Here you can find the source of subtract(final List list1, final List list2)
| Parameter | Description |
|---|---|
| list1 | the list to subtract from |
| list2 | the list to subtract |
| Parameter | Description |
|---|---|
| NullPointerException | if either list is null |
public static List subtract(final List list1, final List list2)
//package com.java2s; /*/*w ww . j a va 2 s . c om*/ * Copyright (c) 2007-2016 AREasy Runtime * * This library, AREasy Runtime and API for BMC Remedy AR System, is free software ("Licensed Software"); * you can redistribute it and/or modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either version 2.1 of the License, * or (at your option) any later version. * * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * including but not limited to, the implied warranty of MERCHANTABILITY, NONINFRINGEMENT, * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. */ import java.util.*; public class Main { /** * Subtracts all elements in the second list from the first list, * placing the results in a new list. * <p/> * This differs from {@link List#removeAll(Collection)} in that * cardinality is respected; if <Code>list1</Code> contains two * occurrences of <Code>null</Code> and <Code>list2</Code> only * contains one occurrence, then the returned list will still contain * one occurrence. * * @param list1 the list to subtract from * @param list2 the list to subtract * @return a new list containing the results * @throws NullPointerException if either list is null */ public static List subtract(final List list1, final List list2) { final ArrayList result = new ArrayList(list1); final Iterator iterator = list2.iterator(); while (iterator.hasNext()) { result.remove(iterator.next()); } return result; } }