Question

I need to convert integer value into hexadecimal.

I have done with some logical, but I want the optimized solutions.

EDIT : Sorry I forgot to post that I am not allowed to use any in-built functions.

Answer 1

Assuming you don’t want to use the built in toHexString for some reason, here’s one pretty efficient way to do it:

 public static char toHexChar(int i) {
  i&=15;
  return (i<10)? (char)(i+48) : (char)(i+55);
 }

 public static String toHexString(int n) {
  char[] chars=new char[8];
  for (int i=0; i<8; i++) {
   chars[7-i]=toHexChar(n);
   n>>=4;
  };
  return new String(chars);
 }