converter for decimal to binary and binary to decimal

Converter.java

package Bitwise;
import java.util.Scanner;

class Converter{
    public String toBinary(int n) {
        String result = "";
        while(n != 0){
            int lastbit = n & 1;
            result = lastbit + result;
            n = n >> 1;
        }

        return result;
    }

    public int toDecimal(int n){
        int result=0;
        int index=0;
        while( n != 0 ){
             int lastdigit = n % 10;
             if(lastdigit==1){
                 result += (int) Math.pow(2,index);
             }
             n =  n / 10;
             index++;
        }
        return result;
    }
}
public class DecimalToBinary {
    public static void main(String[] args) {
        Scanner s=new Scanner(System.in);
        Converter i =new Converter();

        System.out.print("Enter a decimal number : ");
        int decimal = s.nextInt();
        String B = i.toBinary(decimal);
        System.out.println("Binary : " + B );

        System.out.print("Enter a binary number : ");
        int binary = s.nextInt();
        int D= i.toDecimal(binary);
        System.out.println("Decimal : " + D);

    }
}