You will be responsible for the completion of the groceryLine class. The toStrin

Question

You will be responsible for the completion of the groceryLine class. The toString() method and attribute have been given to you.

import java.util.*;

public class Person
{
//attributes
protected String firstName = null;
protected String lastName = null;

//constructor
public Person(String first, String last)
{
this.firstName = first;
this.lastName = last;
}

public String toString()
{

String personDetails = this.firstName + " " + this.lastName +" ";
return personDetails;
}
}

----------------------------------------------------------------------------------------

import java.util.*;

public class PoD
{
public static void main( String [] args )
{
Scanner in = new Scanner( System.in );
GroceryLine groceryLine = new GroceryLine();

//Read in initial line of customers

String inputLine1 = in.nextLine();
String[] initialLine = inputLine1.split(",");

for (int i=0; i<initialLine.length; i++)
{
String[] personDetails = initialLine[i].split(" ");

Person nextPerson = new Person(personDetails[0],personDetails[1]);
groceryLine.newCustomer(nextPerson);
}

System.out.println("--- INITIAL GROCERY LINE ---");
System.out.println(groceryLine);

//Modify initial line of customers

String inputLine2 = in.nextLine();
String[] tasks = inputLine2.split(",");
int lastTask = tasks.length;
Person lastCustomer = null;

for (int i=0; i<lastTask; i++)
{
if (tasks[i].equals("first"))
{
//Next Customer
lastCustomer = groceryLine.nextCustomer();
}
else if (tasks[i].equals("last"))
{
//New Cashier
lastCustomer = groceryLine.newCashier();
}
else
{
//New customer
String[] personDetails = tasks[i].split(" ",2);
lastCustomer = new Person(personDetails[0],personDetails[1]);
groceryLine.newCustomer(lastCustomer);
}

}

System.out.println("Last person to enter/leave line:");
System.out.println(lastCustomer);
System.out.println("--- FINAL GROCERY LINE ---");
System.out.println(groceryLine);

in.close();
System.out.print("END OF OUTPUT");

}
}

---------------------------------------------------------------------------------------

import java.util.*;

public class GroceryLine

{

//attributes

protected LinkedList<Person> groceryLine = new LinkedList<Person>();

//PLEASE FINISH THIS CLASS HERE

//===============================================

//constructor

// method: nextCustomer()

// @returns Person

// Next (first) customer in the line goes is called to the cashier

// method: newCustomer(Person)

// @params Person

// @returns void

// A new customer (Person) joins the end of the line.

// method: newCashier()

// @returns person

// A new cashier opens up. The last person in the line chooses to leave the current line.

//===============================================

//PLEASE END WORK HERE

public String toString()

{

String lineMembers = "GROCERY LINE: ";

int lineCount = 0;

for (Person person: groceryLine)

{

lineCount++;

lineMembers += lineCount + ". " + person.toString();

}

return lineMembers;

}

}

GroceryLine class Grocery Line #groceryLine LinkedList«Perso +GroceryLine() Constructor +nextCustomer) Person Next (first) customer in the line goes is called to the cashier, i.e. the first customer is removed from the line +newCustomer(Person) void A new customer (Person) joins the end of the line. +newCashier Person A new cashier opens up. The last person in the line chooses to leave the current line +toString() String

Explanation / Answer

import java.util.*; public class GroceryLine { //attributes protected LinkedList groceryLine = new LinkedList(); //PLEASE FINISH THIS CLASS HERE //=============================================== //constructor public GroceryLine() { } // method: nextCustomer() // @returns Person public Person nextCustomer() { return groceryLine.removeFirst(); } // Next (first) customer in the line goes is called to the cashier // method: newCustomer(Person) // @params Person // @returns void public void newCustomer(Person person) { groceryLine.add(person); } // A new customer (Person) joins the end of the line. // method: newCashier() // @returns person // A new cashier opens up. The last person in the line chooses to leave the current line. public Person newCashier() { return groceryLine.removeLast(); } //=============================================== //PLEASE END WORK HERE public String toString() { String lineMembers = "GROCERY LINE: "; int lineCount = 0; for (Person person: groceryLine) { lineCount++; lineMembers += lineCount + ". " + person.toString(); } return lineMembers; } }

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