Here you can find the source of removeAll(Collection
static public <T> List<T> removeAll(Collection<T> source, Collection<T> remove)
//package com.java2s; /**/*from w w w . j a v a 2 s. c o m*/ * Copyright 2014, Emory University * * 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.Collection; import java.util.List; public class Main { static public <T> List<T> removeAll(Collection<T> source, Collection<T> remove) { List<T> list = new ArrayList<>(source); list.removeAll(remove); return list; } }