Bazicna upotreba na Stack

package asda;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

interface Stack<E>
{
    public void push(E element);
    public E pop();
    public E peek();
    public boolean isFull();
    public boolean isEmpty();
    public void clear();
}
class ArrayStack<E> implements Stack
{
    int depth;
    int size;
    E elems[];
    public ArrayStack(int size)
    {
        this.size = size;
        elems = (E[]) new Object[size];
        depth = 0;
    }
    @Override
    public void push(Object element) {
        E pom = (E) element;
        elems[depth++] = pom;
    }

    @Override
    public Object pop() {
        E pom = elems[--depth];
        elems[depth]=null;
        return pom;
    }

    @Override
    public Object peek() {
        return elems[depth-1];
    }

    @Override
    public boolean isFull() {
        return depth == size;
    }

    @Override
    public boolean isEmpty() {
        return depth ==0;
    }

    @Override
    public void clear() {
        for(int i=0;i<depth;i++)
        {
            elems[i] = null;
        }
        depth = 0;

    }
}
public class Asda {


    public static void main(String[] args) throws IOException{
        ArrayStack<Byte> magacin =new  ArrayStack<>(32);
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(stdin.readLine());

        while(N>0)
        {
            magacin.push(N%2);
            N = N/2;

        }
        while(!magacin.isEmpty())
        {
            System.out.print(magacin.pop());
        }
        System.out.println();
    }

}