Android Hex String Create isHexChar(char ch)

Description

Return true if the string is HexChars(1234567890abcdefABCDEF).

License

Open Source License

Declaration

public static byte isHexChar(char ch) 

Method Source Code

//package com.java2s;

public class Main {
    /**//from   w  w  w.  ja  v  a  2  s.  c o m
     * Return true if the string is HexChars(1234567890abcdefABCDEF).
     *
     */
    public static byte isHexChar(char ch) {
        if ('a' <= ch && ch <= 'f')
            return (byte) (ch - 'a' + 10);
        if ('A' <= ch && ch <= 'F')
            return (byte) (ch - 'A' + 10);
        if ('0' <= ch && ch <= '9')
            return (byte) (ch - '0');

        return -1;
    }

    /**
     * Method Check String 
     *
     * @param The string to be format.
     * 
     * @param checkSpaceFlag=false: skip the space.
     *
     */
    public static boolean isHexChar(String hexString, boolean checkSpaceFlag) {
        if (null == hexString || 0 == hexString.length())
            return false;

        int hexLen = hexString.length();
        int hexCharCount = 0;
        char ch;
        for (int i = 0; i < hexLen; i++) {
            ch = hexString.charAt(i);
            if (ch == ' ') {
                if (checkSpaceFlag)
                    return false;
            } else {
                if (isHexChar(ch) < 0)
                    return false;
                else
                    hexCharCount++;
            }
        }

        if (hexCharCount % 2 != 0)
            return false;

        return true;
    }

    /**
     * Method Check String 
     *
     * @param The string to be format.
     *
     */
    public static boolean isHexChar(String hexString) {
        return isHexChar(hexString, true);
    }
}

Related

1. appendHex(StringBuffer sb, byte b)
2. isHexChar(String hexString, boolean checkSpaceFlag)
3. isHexChar(String hexString)
4. toHexChar(int nibble)
5. appendHex(final StringBuffer buf, final byte i)