Java Hex Calculate toHexDigit(int number)

Description

Return the single digit character representing the HEX encoding of the lower four bits of a given integer.

License

Open Source License

Parameter

Parameter	Description
number	number to conver

Return

hex character

Declaration

private static char toHexDigit(int number) 

Method Source Code

//package com.java2s;
/*/*from  w  w w .ja  v  a 2 s.c om*/
*  Adito
*
*  Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
*
*  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; either version 2 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

public class Main {
    /**
     * <p>
     * Return the single digit character representing the HEX encoding of the
     * lower four bits of a given integer.
     * </p>
     * 
     * @param number number to conver
     * @return hex character
     */
    private static char toHexDigit(int number) {
        switch (number & 0x0F) {
        case 0x00:
            return '0';
        case 0x01:
            return '1';
        case 0x02:
            return '2';
        case 0x03:
            return '3';
        case 0x04:
            return '4';
        case 0x05:
            return '5';
        case 0x06:
            return '6';
        case 0x07:
            return '7';
        case 0x08:
            return '8';
        case 0x09:
            return '9';
        case 0x0A:
            return 'A';
        case 0x0B:
            return 'B';
        case 0x0C:
            return 'C';
        case 0x0D:
            return 'D';
        case 0x0E:
            return 'E';
        case 0x0F:
            return 'F';
        }
        String message = "Invalid HEX digit " + Integer.toHexString(number); //$NON-NLS-1$
        throw new IllegalArgumentException(message);
    }

    /**
     * <p>
     * Return the HEX representation of an array of bytes.
     * </p>
     * 
     * @param buffer the array of bytes to convert in a HEX {@link String}.
     * @return a <b>non-null</b> {@link String} instance.
     */
    public static String toHexString(byte buffer[]) {
        char output[] = new char[buffer.length * 2];
        int position = 0;
        for (int x = 0; x < buffer.length; x++) {
            output[position++] = toHexDigit(buffer[x] >> 4);
            output[position++] = toHexDigit(buffer[x]);
        }
        return new String(output);
    }

    /**
     * <p>
     * Return the HEX representation of a byte.
     * </p>
     * 
     * @param number the byte to convert in a HEX {@link String}.
     * @return a <b>non-null</b> 2-characters {@link String} instance.
     */
    public static String toHexString(byte number) {
        char output[] = new char[2];
        output[0] = toHexDigit((int) (number >> 4));
        output[1] = toHexDigit((int) (number));
        return new String(output);
    }
}

Related

1. toHexDigit(char ch, int index)
2. toHexDigit(int d)
3. toHexDigit(int d)
4. toHexDigit(int h)
5. toHexDigit(int i)
6. toHexDigit(int value, int digitPosition)
7. toHexDigits(byte[] bytes)
8. toHexDigits(int value)
9. toHexDump(byte[] ab, int cBytesPerLine)