Here you can find the source of containsNone(Collection
public static <T> boolean containsNone(Collection<T> container, Collection<T> other)
//package com.java2s; /******************************************************************************* * Copyright 2009, 2010 Lars Grammel // w w w . ja va 2 s . c om * * 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.Collection; public class Main { public static <T> boolean containsNone(Collection<T> container, Collection<T> other) { assert container != null; assert other != null; for (T t : other) { if (container.contains(t)) { return false; } } return true; } }