05. Printer Queue

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

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        Deque<String> queue = new ArrayDeque<>();
        String line = "";
        while (!"print".equals(line=scan.nextLine())){
            if (!"cancel".equals(line)){
                queue.offer(line);
            }else {
                if (!queue.isEmpty()){
                    System.out.println("Canceled " + queue.poll());
                }else {
                    System.out.println("Printer is on standby");
                }
            }
        }
        System.out.println(String.join(System.lineSeparator(), queue));
//         while (queue.size() != 0){
//           System.out.println(queue.poll());
    }
}