import java.util.Scanner;

public class CustomersQueue {

public static void main(String[] args) {

// initiate an ArrayQueue object called "customers" to represent a waiting queue

// create a scanner

// create a variable "command" to store user's selected option (returned from the method: menu)

// In the while loop as long as the user's option is not 'X'- exit, then continue the iteration

// you may consider using case-switch statement or multiple-if statement

// If user selected option is 'N', then call offer method in ArrayQueue

// If user selected option is 'D', then call peek method in ArrayQueue

// If user selected option is 'R', then call poll method in ArrayQueue

// If user selected option is 'L', then return queue size

//** If user selected option is 'W', then (1)ask user to enter the customer's name (2) call "waitlength" method

// And then display the number of people ahead of user entered customer, or show error message if the customer is not found.

// close the scanner

}

/**

* waitLength method

* @param customers

* @param who

* @return the length of the queue (the number of customers in the queue)

*/

private static int waitLength(ArrayQueue customers, String who) {

int count = 0;

for (String e : customers) {

if (e.equals(who)) return count;

count++;

}

return -1;

}

/** * getCustomer method asked user to enter customer's name

* @param scan

* @return user entered customer's name as string

*/

private static String getCustomer(Scanner scan) {

System.out.println("Enter customer name:");

return scan.nextLine().trim();

}

/** * A method called menu: show six options to users: * N - New Customer * D - Display First Customer in Line * R - Remove First Customer in Line * L - Display Line Length * W - Display wait length for specific customer * X - Exit * *

@param scan

* @return user's option: data type is char

*/

private static char menu(Scanner scan) {

//display the six options to the user

// trim the user input option

String next = scan.nextLine().trim();

// create a variable (char type) to store user's selection

// If user entered a valid selection then return the command, otherwise

// display an error message indicating it is invalid selection and display the menu again

return 'X';

// placeholder. return command;

}

}