private static byte hexValueOf(String hex) {
byte result = 0;
if (hex.charAt(0) == '0'
&& (hex.charAt(1) == 'X' || hex.charAt(1) == 'x')) {
for (int i = 2; i < hex.length(); i++) {
char temp = hex.charAt(i);
if (i == 2) {
if (temp == '0' || temp == '1' || temp == '2'
|| temp == '3' || temp == '4' || temp == '5'
|| temp == '6' || temp == '7') {
result += Byte.valueOf(temp + "") * 16;
}
} else {
if (temp == '0' || temp == '1' || temp == '2'
|| temp == '3' || temp == '4' || temp == '5'
|| temp == '6' || temp == '7') {
result += Byte.valueOf(temp + "");
}
if (temp == 'A' || temp == 'a' || temp == 'B'
|| temp == 'b' || temp == 'C' || temp == 'c'
|| temp == 'D' || temp == 'd' || temp == 'E'
|| temp == 'e' || temp == 'F' || temp == 'f') {
switch (temp) {
case 'A':
result += Byte.valueOf(10 + "");
break;
case 'a':
result += Byte.valueOf(10 + "");
break;
case 'B':
result += Byte.valueOf(11 + "");
break;
case 'b':
result += Byte.valueOf(11 + "");
break;
case 'C':
result += Byte.valueOf(12 + "");
break;
case 'c':
result += Byte.valueOf(12 + "");
break;
case 'D':
result += Byte.valueOf(13 + "");
break;
case 'd':
result += Byte.valueOf(13 + "");
break;
case 'E':
result += Byte.valueOf(14 + "");
break;
case 'e':
result += Byte.valueOf(14 + "");
break;
case 'F':
result += Byte.valueOf(15 + "");
break;
case 'f':
result += Byte.valueOf(15 + "");
break;
default:
break;
}
}
}
}
}
return result;
}
System.out.println("<<<<<"+(hexValueOf("0X7f")));
System.out.println("<<<<<"+(hexValueOf("0X7f")==127));