java base converter (incomplete)

/*
    This is a java program that convert a number in decimal to another base.
    Because it still incomplete, it can only convert to base 2 until 9.
*/

//Author: Muhammad Amir Zaki Bin Zainal Alam

import java.util.*;
public class Decimal_To_Converter
{
    public static void main(String args[])
    {
        String ans = "", ans2 = "A";
        int num, num2, num3=0, base, from;
       
        Scanner scanner = new Scanner(System.in);
       
        //System.out.print("Enter number's base : ");
        //from = scanner.nextInt();
        System.out.print("\nEnter number in base entered : ");
        num = scanner.nextInt();
        System.out.print("\nEnter base to convert to : ");
        base = scanner.nextInt();
        num3 = num / base;
 

        if (base > 0 && base < 11 && num > base && num != base)// && base > from)
        {
            if(num>0)
                while (num / base != 0)
                {
                    ans = (num % base) + ans;
                    num = num / base;
                }
               
            ans = num + ans;
        }
       
       // else if (base > 0 && base < 11 && num > base && from > base)
       //{
       //    if(num>0)
       //       while (num /
       
        /*else if (base > 10 && base < 17)
        {
            while (num / base != 0)
            {
                if(num % base > 9)
                {
                        if (num3 == 10)
                            ans2 = "A";                       
                        if (num3 == 11)
                            ans2 = "B";                         
                        if (num3 == 12)
                            ans2 = "C";         
                        if (num3 == 13)
                            ans2 = "D";                       
                        if (num3 == 14)
                            ans2 = "E";                       
                        if (num3 == 15)
                            ans2 = "F";
                   
                    ans = ans2 + ans;
                }
               
                else
                    ans = (num % base) + ans;
               
                System.out.print(num3 + " ");
                   
                num = num / base;
               
                if (num % base > 9)
                    ans = ans2 + ans;
               
                else
                    ans = (num % base) + ans;
               
            }          
        }*/
      
         System.out.print("\nAnswer : " + ans);
    }
}