CalculateBinary&Decimal

package calculate
import java.util.Scanner;

public class calculate {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int umdois;
        System.out.println("Type 1 Binary to DECIMAL or 2 DECIMAL to Binary");
        umdois = s.nextInt();
        while (umdois != 1 && umdois != 2) {
            System.out.println("Type 1 Binary to DECIMAL or 2 DECIMAL to Binary");
            umdois = s.nextInt();
        }
        if (umdois == 1) {
            System.out.println("Type your Binary Number");
            String num = s.next();
            int potencia = 0, decimal = 0;
            for (int i = num.length() - 1; i >= 0; i--) {
                decimal += Math.pow(2, potencia) * Character.getNumericValue(num.charAt(i));
                potencia++;
                System.out.println("Your Decimal number" + decimal);
            }
            System.out.println("Your Decimal number" + decimal);
        } else {
            System.out.println("Tyoe your Decimal Number");
            int nume = s.nextInt();
            String str = "";
            while (nume != 0) {
                int q = nume % 2;
                str = q + str;
                nume = nume / 2;
            }
            System.out.println(str);
        }
    }
}