Question

I have 3 classes in the same package called Product, Products and ProductCart. Here are my codes->

Product

public class Product {
        //instance variables
        private int id;
        private String name;
        private double price;
        private int quantity;

        //constructor
        public Product(int id, String name, double price, int quantity) {
                this.id = id;
                this.name = name;
                this.price = price;
                this.quantity = quantity;
        }

        //all setters and getters
        public int getId() {
                return id;
        }

        public void setId(int id) {
                this.id = id;
        }

        public String getName() {
                return name;
        }

        public void setName(String name) {
                this.name = name;
        }

        public double getPrice() {
                return price;
        }

        public void setPrice(double price) {
                this.price = price;
        }

        public int getQuantity() {
                return quantity;
        }

        public void setQuantity(int quantity) {
                this.quantity = quantity;
        }

        //toString 
        @Override
        public String toString() {
                return id + ", " + name + ", $" + price + ", " + quantity+"pc";
        }

}

Products

import java.util.ArrayList;

public class Products {
        //for holding items
        private ArrayList productList;

        //initializing the products list
        public Products() {
                productList = new ArrayList<>();
        }

        //getter the product list
        public ArrayList getProductList() {
                return productList;
        }
}

ProductCart

public class ProductCart {
        
        //products vairable
        private Products prod;
        
        public ProductCart() {
                prod = new Products();
        }
        
        //adding items
        public void addItems(Product item) {
                prod.getProductList().add(item);
        }
        
        //removing items
        public boolean removeItem(Product item) {
                return prod.getProductList().remove(item);              
        }
        
        //displaying items
        public void displayItem() {
                for(Product item: prod.getProductList())
                        System.out.println(item);
        }
        
        //getting price of the item
        public double getPriceOfAnItem(Product item) {
                int index = prod.getProductList().indexOf(item);
                if(index == -1) {
                        System.out.println("Product not found");
                        return -1;                      
                }
                else
                        return prod.getProductList().get(index).getPrice();
        }

}

Now I want to create class where I ask the user to choose options to perform these tasks->

1. Display Store Products

2. Display Cart

0. Exit

(example if you choose 1 the console will display this-> 1 Chips 40.0 10, 2 Chocolate 60.0 6, 3 Milk 30.0 10)

(example if you choose 2 the console will display this-> 3. Add to Cart 4. Remove From Cart 0. Exit)

This is my code so far but it's not working well because i can not fix "case 4". Please modify it and fix case 4 or write a code that will help me solve the problem (you may write if else statements instead if you want)->

public static void main(String[] args) {
int user_choice = 5;
Scanner sc = new Scanner(System.in);
ProductCart pc = new ProductCart();
  
while (user_choice != 0) {
System.out.println("Please choose an option");
System.out.println("1.Display Store Products 2.Display Cart 3.Add to cart 4.Remove from cart 0.Exit");
user_choice = sc.nextInt();
  
switch(user_choice) {
case 1:
pc.displayItem();
break;
case 2:
System.out.println("3.Add to cart 4.Remove from cart 0.Exit");
break;
case 3:
System.out.println("enter id");
int id = sc.nextInt();
System.out.println("enter name");
String name = sc.next();
System.out.println("Enter price");
double price = sc.nextDouble();
System.out.println("Enter quantity");
int quantity = sc.nextInt();
Product product = new Product(id, name, price, quantity);
pc.addItems(product);
break;
case 4:
System.out.println("enter id");
int id2 = sc.nextInt();
pc.removeItem(product);
break;
case 0:
System.out.println("Finish the operations and exit");
System.out.println("closing now");
System.exit(0);
break;
  
default:
System.out.println("Enter your choice again");
}
}

}

}

Answer 1

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