ShoppingSpree

import java.util.ArrayList;
import java.util.List;

public class Person {
    private String name;
    private double money;
    private List<Product> products;

    public Person(String name, double money) {
        this.setName(name);
        this.setMoney(money);
        this.products = new ArrayList<>();
    }

    public String getName() {
        return this.name;
    }

    private void setName(String name) {
        if (name == null || name.trim().isEmpty()) {
            throw new IllegalArgumentException("Name cannot be empty");
        }
        this.name = name;
    }

    private void setMoney(double money) {
        if (money < 0) {
            throw new IllegalArgumentException("Money cannot be negative");
        }
        this.money = money;
    }

    public void buyProduct(Product product) {
        if (this.money - product.getCost() >= 0) {
            products.add(product);
        }
    }
}


package shoppingSpree;

public class Product {
    private String name;
    private double cost;

    public Product(String name, double cost) {
        this.setName(name);
        this.setCost(cost);
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        if (name == null || name.trim().isEmpty()) {
            throw new IllegalArgumentException("Name cannot be empty");
        }
        this.name = name;
    }

    public double getCost() {
        return this.cost;
    }

    public void setCost(double cost) {
        if (cost < 0) {
            throw new IllegalArgumentException("Money cannot be negative");
        }
        this.cost = cost;
    }

}