Question

I need this code translated from C++ to Java. Im personally still trying to learn Java, so if you can include screenshots of your IDE/output that would be helpful. Much appreciated!

#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 PizzaQueue {

        static class Pizza {
                String ingrediants, address;
                Pizza next;

                public Pizza(String ingrediants, String address) {
                        this.address = address;
                        this.ingrediants = ingrediants;
                        next = null;
                }
        }
        
        private Pizza head;

        void enqueue( Pizza toAdd) {
                if(head == null) {
                        head = toAdd;
                } else {
                        Pizza p = head;
                        while(p.next != null) {
                                p = p.next;
                        }
                        p.next = toAdd;
                }
        }

        Pizza dequeue() {
                if(head == null) {
                        return null;
                } else {
                        Pizza p = head;
                        head = head.next;
                        return p;
                }
        }
        
        void deliver() {
                Pizza d = dequeue();
                if(d == null) {
                        System.out.println("No deliveries pending");
                } else {
                        System.out.println("Deliver a pizza with " + d.ingrediants
                       + " to " + d.address);
                }
        }

        public static void main(String[] args) {
                PizzaQueue queue = new PizzaQueue();

                queue.enqueue(new Pizza("pepperoni", "1234 Bobcat Trail"));
                queue.enqueue(new Pizza("sausage", "2345 University Drive"));
                queue.deliver();
                queue.enqueue(new Pizza("extra cheese", "3456 Rickster Road"));
                queue.enqueue(new Pizza("everything", "4567 King Court"));
                queue.enqueue(new Pizza("coffee beans", "5678 Java Circle"));
                queue.deliver();
                queue.deliver();
                queue.deliver();
                queue.deliver();
                queue.deliver();
        }

}

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