is Hex Char - Android java.lang

Android examples for java.lang:Hex

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Description

is Hex Char

Demo Code


public class Main{

    /**//from w  w w. j a  v a  2s .c om
     * 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);
    }

}

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