Java Hex Calculate toHexString(int input)

Description

Converts the given int to a Big Endian hex string

License

Open Source License

Parameter

Parameter	Description
input	Input to convert

Return

hex string (8 chars)

Declaration

public static String toHexString(int input) 

Method Source Code

//package com.java2s;
/*//from  www.ja v a  2 s. c o  m
 * File:                HashFunctionUtil.java
 * Authors:             Kevin R. Dixon
 * Company:             Sandia National Laboratories
 * Project:             Cognitive Foundry
 *
 * Copyright Jan 26, 2011, Sandia Corporation.
 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
 * license for use of this work by or on behalf of the U.S. Government.
 * Export of this program may require a license from the United States
 * Government. See CopyrightHistory.txt for complete details.
 *
 */

public class Main {
    /**
     * Char table for convenience
     */
    static final char[] HEX_CHAR_TABLE = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
            'e', 'f' };

    /**
     * Converts the given int to a Big Endian hex string
     * @param input
     * Input to convert
     * @return
     * hex string (8 chars)
     */
    public static String toHexString(int input) {
        // Java's Integer.toHexString doesn't put the leading zero if needed,
        // so we have to do it ourselves... sigh.
        char[] hex = new char[8];
        int index = 0;
        for (int i = 0; i < 4; i++) {
            // If we didn't do the 24-8*i, then we'd end up with a
            // Little Endian result... gross.
            final int b = (input >>> (24 - 8 * i)) & 0xFF;
            hex[index++] = HEX_CHAR_TABLE[b >>> 4];
            hex[index++] = HEX_CHAR_TABLE[b & 0xF];
        }

        String result = null;
        try {
            result = new String(hex);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return result;

    }

    /**
     * Converts the given long to a Big Endian hex string
     * @param input
     * Input to convert
     * @return
     * hex string (16 chars)
     */
    public static String toHexString(long input) {
        // Java's Integer.toHexString doesn't put the leading zero if needed,
        // so we have to do it ourselves... sigh.
        char[] hex = new char[16];
        int index = 0;
        for (int i = 0; i < 8; i++) {
            // If we didn't do the 24-8*i, then we'd end up with a
            // Little Endian result... gross.
            final int b = (int) ((input >>> (56 - 8 * i)) & 0xFF);
            hex[index++] = HEX_CHAR_TABLE[b >>> 4];
            hex[index++] = HEX_CHAR_TABLE[b & 0xF];
        }

        String result = null;
        try {
            result = new String(hex);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return result;

    }

    /**
     * Converts a byte array to a lower-case Hex string
     * @param bytes
     * byte array to convert
     * @return
     * String representing the byte array
     */
    public static String toHexString(byte[] bytes) {
        char[] hex = new char[2 * bytes.length];
        int index = 0;
        for (int i = 0; i < bytes.length; i++) {
            final int b = (bytes[i] & 0xFF);
            hex[index++] = HEX_CHAR_TABLE[b >>> 4];
            hex[index++] = HEX_CHAR_TABLE[b & 0xF];
        }

        String result = null;
        try {
            result = new String(hex);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return result;
    }
}

Related

1. toHexString(int i)
2. toHexString(int i)
3. toHexString(int i)
4. toHexString(int i)
5. toHexString(int i, int digits)
6. toHexString(int iValue)
7. toHexString(int n)
8. toHexString(int number, int digit)
9. toHexString(int r, int g, int b, int a)