Re: String to byte[] -- I cant get there from here?

When I look for String to unsingned byte, I essentially have two
choices, neither of which work.

Take, for instance:

public static void main(String[] args) {
    try{
        String s = "0F";
        byte u =(byte)Integer.parseInt(s.trim());
        System.out.println(u);
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            System.exit(0);
        }
    }

This results in :
java.lang.NumberFormatException: For input string: "0F"

Similartly, if I go with:
              try{
        String s = "0F";
        byte u =(byte)Integer.parseInt(s.trim(),16);
        System.out.println(u);
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            System.exit(0);
        }

It results in printing out 15, which is incorrect, it should print out
0F as the value for the byte.