BinToDecJava

import java.util.Stack;

public class Program {

    public static void decToBinString(int number) {
        String bin = "";
        while (number != 0) {
            bin += number % 2;
            number /= 2;
        }
        // reverse
        for(int i = bin.length() - 1; i >= 0; i--) {
            System.out.print(bin.charAt(i));
        }
    }

    public static void decToBinStack(int number) {
        Stack<Integer> bin = new Stack<Integer>();
        while (number != 0) {
            bin.push(number % 2);
            number /= 2;
        }

        while (!bin.empty()) {
            System.out.print(bin.pop());
        }
    }

    public static void main(String[] args) {
        decToBinString(25);
        System.out.println();
        decToBinStack(25);
    }

}