Question: Change the program given below to handle the following: a. There are now 3 queues to maintain: High, Medium and Low priority. b. When a
Change the program given below to handle the following:
a. There are now 3 queues to maintain: High, Medium and Low priority.
b. When a name is entered, the priority level is also given.
c. The name is added/removed in the proper queue based on priority level.
d. Update all functions to include the 3 Queues.
e. Add priority as a data field.
import java.util.Arrays;
import java.util.Queue;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Scanner;
public class MaintainQueue {
// Data Field
private final Queue
private final Scanner in;
// Constructor
/** Create an empty queue. */
public MaintainQueue() {
customers = new LinkedList<>();
in = new Scanner(System.in);
}
/**/
/*
/**
* Performs the operations selected on queue customers.
* @pre customers has been created.
* @post customers is modified based on user selections.
*/
public void processCustomers() {
String choice = "";
String[] choices = {
"add", "peek", "remove", "size", "position", "quit"};
// Perform all operations selected by user.
while (!choice.equals("quit")) {
// Process the current choice.
try {
String name;
System.out.println("Chose from the list: "
+ Arrays.toString(choices));
choice = in.nextLine();
switch (choice) {
case "add":
System.out.println("Enter new customer name");
name = in.nextLine();
customers.offer(name);
System.out.println(
"Customer " + name
+ " added to the queue");
break;
case "peek":
System.out.println(
"Customer " + customers.element()
+ " is next in the queue");
break;
case "remove":
System.out.println(
"Customer " + customers.remove()
+ " removed from the queue");
break;
case "size":
System.out.println(
"Size of queue is " + customers.size());
break;
case "position":
System.out.println("Enter customer name");
name = in.nextLine();
int countAhead = 0;
for (String nextName : customers) {
if (!nextName.equals(name)) {
countAhead++;
} else {
System.out.println(
"The number of customers ahead of "
+ name + " is " + countAhead);
break; // Customer found, exit loop.
}
}
// Check whether customer was found.
if (countAhead == customers.size()) {
System.out.println(
name + " is not in queue");
}
break;
case "quit":
System.out.println(
"Leaving customer queue. "
+ " Number of customers in queue is "
+ customers.size());
break;
default:
System.out.println("Invalid choice -- try again");
} // end switch
} catch (NoSuchElementException e) {
System.out.println(
"The Queue is empty");
} // end try-catch
} // end while
}
/*
/*
/**
* Create a string representation of the queue contents with each
* entry on its own line
* @return a String representation of the queue contents
*/
@Override
public String toString() {
return String.join(" ", customers);
}
/**/
public static void main(String[] args) {
(new MaintainQueue()).processCustomers();
}
}
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