Parsing machine code

Question

I have a need for a program that can parse a 4-digit hexadecimal code and take action on it. The first and last digits are frequently the most important, but all of the digits can be varied. I have several methods in mind, but what is the fastest or most efficient way in java to operate on the digits individually?

Answer 1

You could do something similar to this.
public class HexToInt {
     public static void main(String args[]){
          String hex = "A7FE"; //Hexadecimal number
          int count = hex.length();
          String[] c = new String[count];
          for(int i = 0; i < count; i++){
               c[i] = String.valueOf(hex.charAt(i)); //Grab single hex character
               System.out.println("Hex digit at element " + i + " is " + convert(c)); //Convert character to integer
     public static int convert(String hex){
          return Integer.valueOf(hex, 16);
}I'm not exactly sure if this was the kind of action you were looking for, but this is just a simple program that converts a single hexadecimal character from a string and prints it out as an integer.