Converts a signed byte into an unsigned byte. - Java java.lang

Java examples for java.lang:byte

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Description

Converts a signed byte into an unsigned byte.

Demo Code

/*//  ww  w .  ja  v a  2 s  .c  o m

Copyright (C) SYSTAP, LLC 2006-2008.  All rights reserved.

Contact:
     SYSTAP, LLC
     4501 Tower Road
     Greensboro, NC 27410
     licenses@bigdata.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        int v = 2;
        System.out.println(encodeByte(v));
    }

    /**
     * Converts a signed byte into an unsigned byte.
     * 
     * @param v
     *            The signed byte.
     *            
     * @return The corresponding unsigned value.
     */
    final static byte encodeByte(final int v) {

        if (v > 127 || v < -128)
            throw new IllegalArgumentException("v=" + v);

        int i = v;

        if (i < 0) {

            i = i - 0x80;

        } else {

            i = i + 0x80;

        }

        return (byte) (i & 0xff);

    }
}

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