Question

design two java classes

The example of output would be this:

user puts the amount of money: (for example 9000)
I'm going to get three things
1. Cellphone cost: 3000
2. Laptop cost: 6000
3. Macbook cost: 4000

From now on, my balance would be (+balance) and I bought cellphone, laptop,
(since there is not enough amount of money, I can only buy cellphone and laptop. if there is enough money then it can buy all things)

so I have to create two classes that are person and product
here is my main code :

class Cellphone extends Product {
public Cellphone(int price, String name) {
super(price, name);
}
}

class Computer extends Product {
public Computer(int price, String name) {
super(price, name);
}
}

class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
       items[0] = new Cellphone(3000, "Cellphone");
       items[1] = new Computer(5000, "laptop");
       items[2] = new Computer(4000, "Macbook");
int balance = 0;
       Product[] items = new Product[3];
      
       System.out.print("amount of money: ");
       balance = sc.nextInt();
       Person p = new Person(balance);
      
       System.out.println("\nI'm going to get three things");
       for (int i = 0; i < 3; i++)
       System.out.println((i + 1) + ". " + items[i].name + ": " + items[i].price);

       for (int i = 0; i < 3; i++)
           p.buy(items[i]);
      
       System.out.println("\nFrom now on, my balance would be " + p.getBalance() + " and I bought");
       for (int i = 0; i < p.getItemsCount(); i++)
           System.out.print(p.myItems[i] + ", ");
      
       sc.close();
}
}

Answer 1

thanks for the question, here are all the 5 classes.

=========================================================================================

public class Product {

    private String name;
    private int price;

    public Product( int price, String name) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public int getPrice() {
        return price;
    }

    @Override
    public String toString() {
        return name;
    }
}

=========================================================================================

public class Cellphone extends Product {


    public Cellphone(int price, String name) {
        super(price, name);
    }
}

=========================================================================================

public class Computer extends Product {


    public Computer(int price, String name) {
        super(price, name);
    }
}

=========================================================================================

public class Person {


    private int balance;
    public Product[] myItems;
    private int counter;

    public Person(int bal) {
        this.balance = bal;
        myItems = new Product[3];
        counter = 0;

    }

    public void buy(Product product) {

        if (product.getPrice() < this.balance) {
            myItems[counter++] = product;
            this.balance -= product.getPrice();
        }

    }

    public int getBalance() {
        return balance;
    }

    public int getItemsCount() {
        return counter;
    }
}

=========================================================================================

import java.util.Scanner;


class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Product[] items = new Product[3];
        items[0] = new Cellphone(3000, "Cellphone");
        items[1] = new Computer(5000, "laptop");
        items[2] = new Computer(4000, "Macbook");
        int balance = 0;

        System.out.print("amount of money: ");
        balance = sc.nextInt();
        Person p = new Person(balance);

        System.out.println("\nI'm going to get three things");
        for (int i = 0; i < 3; i++)
            System.out.println((i + 1) + ". " + items[i].getName() + ": " + items[i].getPrice());

        for (int i = 0; i < 3; i++)
            p.buy(items[i]);

        System.out.println("\nFrom now on, my balance would be " + p.getBalance() + " and I bought");
        for (int i = 0; i < p.getItemsCount(); i++)
            System.out.print(p.myItems[i] + ", ");

        sc.close();
    }
}

=========================================================================================