Java Hex Calculate toHexShortString(byte[] bytes)

Description

Returns a String representing the byte[] as a sequence of uppercase hexadecimal characters, starting with "0x".

License

Open Source License

Parameter

Parameter	Description
bytes	the byte array to convert.

Return

a String representing the value of bytes as hexadecimal characters, starting with "0x". If bytes is null or has a length of 0, then the String "0x" is returned.

Declaration

public static String toHexShortString(byte[] bytes)

Method Source Code

//package com.java2s;
/*// w ww .j av a 2 s .co m
 * Owl Platform Common Library for Java
 * Copyright (C) 2012 Robert Moore and the Owl Platform
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *  
 * 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 Lesser General Public License for more details.
 *  
 * You should have received a copy of the GNU Lesser General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

public class Main {
    /**
     * List of hexadecimal (base 16) characters for printing.
     */
    public static char[] HEX_CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
            'F' };

    /**
     * Returns a String representing the byte[] as a sequence of uppercase
     * hexadecimal characters, starting with "0x". Omitting any leading 0-value
     * bytes.
     * 
     * @param bytes
     *          the byte array to convert.
     * @return a String representing the value of {@code bytes} as hexadecimal
     *         characters, starting with "0x". If {@code bytes} is null or has a
     *         length of 0, then the String "0x" is returned.
     */
    public static String toHexShortString(byte[] bytes) {
        StringBuffer sb = new StringBuffer("0x");

        boolean leadingZeros = true;
        if (bytes != null) {
            for (byte b : bytes) {
                if (leadingZeros && b == 0)
                    continue;
                leadingZeros = false;
                sb.append(HEX_CHARS[0x0F & (b >> 4)]).append(HEX_CHARS[b & 0x0F]);
            }
        }
        return sb.toString();
    }
}