Java Utililty Methods Hex to Int

String hexString = stringify_nospaces(hex);
String asciiString = convertHexToString(hexString);
return convertHexStringToInt(asciiString);

if (c >= '0' && c <= '9')
    return c - '0';
if (c >= 'A' && c <= 'F')
    return c - 'A' + 10;
if (c >= 'a' && c <= 'f')
    return c - 'a' + 10;
return 0;

return Integer.valueOf(hex, 16);

int val = 0;
if ((hexString != null) && (hexString.length() > 0)) {
    String hexVal = hexString.trim();
    int ndex = 0;
    if (hexVal.startsWith("0x"))
        ndex = 2;
    hexVal = hexVal.substring(ndex);
    val = Integer.parseInt(hexVal, 16);
...

if (in == null) {
    return null;
} else {
    if (in.equals("**"))
        return "*";
    int hex = Integer.parseInt(in, 16);
    return String.valueOf(Integer.toString(hex));

hex = hex.toLowerCase();
char[] chex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
int[] c = { 0, 0, 0, 0 };
for (int j = 0; j < 4; j++) {
    for (int i = 0; i < 16; i++) {
        if (hex.charAt(j) == chex[i]) {
            c[j] = i;
int no = (c[3] + (16 * c[2]) + (16 * 16 * c[1]) + (16 * 16 * 16 * c[0]));
return no;

if (hex > 47 && hex < 58) {
    hex -= 48;
} else if (hex > 64 && hex < 71) {
    hex -= 55;
} else if (hex > 96 && hex < 103) {
    hex -= 87;
} else {
    throw new RuntimeException(hex + "is not a valid hex char.");
...

boolean f1 = ch >= '0' && ch <= '9';
boolean f2 = ch >= 'A' && ch <= 'F';
boolean f3 = ch >= 'a' && ch <= 'f';
if (!(f1 || f2 || f3)) {
    return -1;
if (f1) {
    return (byte) (ch - '0');
...