Convert a decimal number to hexadecimal number

Write a Java program to convert a decimal number to hexadecimal number.

Decimal number: The decimal numeral system is the standard system for denoting integer and non-integer numbers. It is also called base-ten positional numeral system.

Hexadecimal number: Hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a, b, c, d, e, f) to represent values ten to fifteen.

Test Data:
Input a decimal number: 15

Java Code:

import java.util.Scanner;

public class Exercise20 {

      public static void main(String args[])

    {

        int dec_num, rem;

        String hexdec_num="";

        /* hexadecimal number digits */       

        char hex[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};       

        Scanner in = new Scanner(System.in);         

        System.out.print("Input a decimal number: ");

        dec_num = in.nextInt();      

        while(dec_num>0)

        {

            rem = dec_num%16;

            hexdec_num = hex[rem] + hexdec_num;

            dec_num = dec_num/16;

        }

        System.out.print("Hexadecimal number is : "+hexdec_num+"\n");        

    }

}

Output:

Input a decimal number: 15                                                                                    

Hexadecimal number is : F