Question

Convert the attached C++ code to working Java code. Be judicious in the change that you make. This assignment is not about re-writing or improving this code, but rather about recognizing the differences between C++ and Java, and making the necessary coding changes to accommodate how Java does things. PLEASE DO NOT use a built-in Java QUEUE (or any other) container. Additional resources for assignment:

#include <iostream>

#include <string>

using namespace std;

class pizza

{

public:

string ingrediants, address;

pizza *next;

pizza(string ingrediants, string address)

{

this->address = address;

this->ingrediants = ingrediants;

next = NULL;

}

};

void enqueue(pizza **head, pizza **tail, pizza *thispizza)

{

if (*head == NULL) *head = thispizza;

else (*tail)->next = thispizza;

*tail = thispizza;

return;

}

pizza* dequeue(pizza **head, pizza **tail)

{

pizza* pizzatodeliver = NULL;

if (*head != NULL)

{

pizzatodeliver = *head;

*head = (*head)->next;

}

if (*head == NULL) *tail = NULL;

return pizzatodeliver;

}

void deliver(pizza **head, pizza`** tail)

{

pizza *thispizza = dequeue(head, tail);

if (thispizza == NULL)

{

cout << "No deliveries pending" << endl; return;

}

cout << "Deliver a pizza with " << thispizza->ingrediants

<< " to " << thispizza->address << endl;

}

int main()

{

pizza *first = NULL, *last = NULL;

enqueue(&first, &last, new pizza("pepperoni", "1234 Bobcat Trail"));

enqueue(&first, &last, new pizza("sausage", "2345 University Drive"));

deliver(&first, &last);

enqueue(&first, &last, new pizza("extra cheese", "3456 Rickster Road"));

enqueue(&first, &last, new pizza("everything", "4567 King Court"));

enqueue(&first, &last, new pizza("coffee beans", "5678 Java Circle"));

deliver(&first, &last);

deliver(&first, &last);

deliver(&first, &last);

deliver(&first, &last);

deliver(&first, &last);

cin.get();

return 0;

}

Answer 1

public class pizza

{

public String ingrediants;
public String address;

public pizza next;

public pizza(String ingrediants, String address)

{

this.address = address;

this.ingrediants = ingrediants;

next = null;

}

}

package <missing>;

public class GlobalMembers
{
   public static void enqueue(pizza[] head, pizza[] tail, pizza thispizza)

   {

   if (head[0] == null)
   {
       head[0] = thispizza;
   }

   else
   {
       tail.next = thispizza;
   }

   tail[0] = thispizza;

   return;

   }

   public static pizza dequeue(pizza[] head, pizza[] tail)

   {

   pizza pizzatodeliver = null;

   if (head[0] != null)

   {

   pizzatodeliver = head[0];

   head[0] = head.next;

   }

   if (head[0] == null)
   {
       tail[0] = null;
   }

   return pizzatodeliver;

   }

   public static void deliver(pizza[] head, pizza`[] tail)

   {

   pizza thispizza = dequeue(head, tail);

   if (thispizza == null)

   {

   System.out.print("No deliveries pending");
   System.out.print("\n");
   return;

   }

   System.out.print("Deliver a pizza with ");
   System.out.print(thispizza.ingrediants);
   System.out.print(" to ");
   System.out.print(thispizza.address);
   System.out.print("\n");

   }

   public static int Main()

   {

   pizza first = null;
   pizza last = null;

   enqueue(first, last, new pizza("pepperoni", "1234 Bobcat Trail"));

   enqueue(first, last, new pizza("sausage", "2345 University Drive"));

   deliver(first, last);

   enqueue(first, last, new pizza("extra cheese", "3456 Rickster Road"));

   enqueue(first, last, new pizza("everything", "4567 King Court"));

   enqueue(first, last, new pizza("coffee beans", "5678 Java Circle"));

   deliver(first, last);

   deliver(first, last);

   deliver(first, last);

   deliver(first, last);

   deliver(first, last);

   System.in.read();

   return 0;

   }
}