hex to string, string to hex

 public String convertHexToString(String hex){
 
   StringBuilder sb = new StringBuilder();
   StringBuilder temp = new StringBuilder();
 
   //49204c6f7665204a617661 split into two characters 49, 20, 4c...
   for( int i=0; i<hex.length()-1; i+=2 ){
 
       //grab the hex in pairs
       String output = hex.substring(i, (i + 2));
       //convert hex to decimal
       int decimal = Integer.parseInt(output, 16);
       //convert the decimal to character
       sb.append((char)decimal);
 
       temp.append(decimal);
   }
   System.out.println("Decimal : " + temp.toString());
 
   return sb.toString();
  }

  public String convertStringToHex(String str){
 
   char[] chars = str.toCharArray();
 
   StringBuffer hex = new StringBuffer();
   for(int i = 0; i < chars.length; i++){
     hex.append(Integer.toHexString((int)chars[i]));
   }
 
   return hex.toString();
  }