QbyStack.java

import java.util.*;
public class QbyStack {
     static class Queue{
        static Stack<Integer> s1=new Stack<>();
        static Stack<Integer> s2=new Stack<>();

        public static boolean isEmpty(){
            return s1.isEmpty();
        }

        public static void add(int data){
            while(!s1.isEmpty()){
                s2.push(s1.pop());
            }
            s1.push(data);

            while(!s2.isEmpty()){
                s1.push(s2.pop());
            }
        }
        public static int remove(){
            if(isEmpty()){
                System.out.print("queue is empty");
                return -1;
            }
            return s1.pop();
        }

        public static int peek(){
            if(isEmpty()){
                System.out.print("queue is empty");
                return -1;
            }
            return s1.peek();

        }
     }
public static void main(String[] args) {
    Queue q=new Queue();
    q.add(1);
    q.add(2);
    q.add(3);
    q.add(4);
    q.add(5);
    
    while(!q.isEmpty())
{
System.out.println(q.peek());
q.remove();
    
}
    
}
}