convert decimal to binary

public class Solution {
    public static void main(String[] args) {
        int dNum = ;
        String str = "";
        while (dNum > ) {
            int rem = dNum % ;
            str = rem + str;
            dNum = dNum / ;
        }
        System.out.println("Binary value is: " + str);
    }
}

OUTPUT:
Binary value is: