Browser History Upgrade [Mimi][JA]

import java.util.ArrayDeque;
import java.util.Scanner;

public class _08_BrowserHistoryUpgrade2 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        ArrayDeque<String> s = new ArrayDeque<>();
        ArrayDeque<String> q = new ArrayDeque<>();

        String input = "";
        while (!"Home".equals(input = sc.nextLine())) {
            if (input.equals("back")) {
                if (s.size() > 1) {
                    q.push(s.pop());
                    String current = s.peek();
                    System.out.println(current);
                } else {
                    System.out.println("no previous URLs");
                }
            } else if (input.equals("forward")) {
                if (!q.isEmpty()) {
                    s.push(q.peek());
                    System.out.println(q.poll());

                } else {
                    System.out.println("no next URLs");
                }
            } else {
                if (!q.isEmpty()) {
                    q.clear();
                }
                s.push(input);
                System.out.println(s.peek());
            }
        }
    }
}