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如果mask中的所有位都设置为bit，则为true。
/******************************************************************************* * Copyright 2014 Analog Devices, Inc. * * 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. ********************************************************************************/ //package com.nowjava; /* NowJava.com 提供 */ public class Main { public static void main(String[] argv) throws Exception { int bits = 2; int mask = 2; System.out.println(isMaskSet(bits, mask)); } /** * True if all bits in {@code mask} are set in {@code bits}. */ public static boolean isMaskSet(int bits, int mask) {//N o w J a v a . c o m 提 供 return (bits & mask) == mask; }