Java Hex Calculate toHex(Long value, int charCount)

Description

Return a number as hex value with specified char count.

License

Open Source License

Declaration

public static String toHex(Long value, int charCount) 

Method Source Code

//package com.java2s;

public class Main {
    /**//from w w  w . jav  a2 s  .co m
     * Return a number as hex value with specified char count.
     */
    public static String toHex(Long value, int charCount) {
        String s = Long.toHexString(value).toUpperCase();

        while (s.length() > charCount) {
            s = s.substring(1);
            //throw new IllegalStateException("Generated Number larger than "
            //         + "charCount:\nnumber: " + s + "\ncharCount: " + charCount);
        }

        if (s.length() < charCount) {
            int diff = charCount - s.length();
            for (int i = 0; i < diff; i++)
                s = "0" + s;
        }

        return (s);
    }

    public static String toHex(byte[] data) {
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;

            do {
                if ((0 <= halfbyte) && (halfbyte <= 9))
                    buf.append((char) ('0' + halfbyte));
                else
                    buf.append((char) ('a' + (halfbyte - 10)));

                halfbyte = data[i] & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }
}

Related

1. toHex(int value, int length)
2. toHex(int value, int minNumOfDigits)
3. toHex(long i)
4. toHex(long i, int r0, boolean r1)
5. toHex(long l, int length)
6. toHex(long value, int length)
7. toHex(String color)
8. toHex(String in, boolean javaStyle)
9. toHEX(String ostr)