title: Don't understand Character.digit in Java
body: <p>I'm not sure I understand what this method does. Can someone explain ?
  All I know, from what I read, is that "This method returns the numeric value represented by the character in the specified radix."
  I'm not sure what a radix is and what it represents. According to the description of what is being returned, I assumed this method gets a character and returns the numeric value of it in the ASCII table, but I guesses that's not true ?</p>