Here you can find the source of setBitByPos(byte byt, boolean bool, int pos)
public static byte setBitByPos(byte byt, boolean bool, int pos)
//package com.java2s; /*//from w w w . ja v a 2 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. */ public class Main { private static final int[] mask = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; private static final int[] invMask = { 0xFE, 0xFD, 0xFB, 0xF7, 0xEF, 0xDF, 0xBF, 0x7F }; public static byte setBitByPos(byte byt, boolean bool, int pos) { if (bool) { return (byte) ((int) byt | mask[pos]); } else { return (byte) ((int) byt & invMask[pos]); } } }