Here you can find the source of byteToUnsigned(byte b)
private static final int byteToUnsigned(byte b)
//package com.java2s; /*/*from www . j a v a2 s . c o m*/ * @(#)$Id: Helper.java 116 2008-10-30 06:12:51Z unsaved $ * * Copyright 2008 by the JWebMail Development Team and Sebastian Schaffert. * * 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. */ public class Main { private static final int byteToUnsigned(byte b) { int value = (int) b; return (value >= 0 ? value : value + 256); } }