The program defines the class Product.

Write the method
public static Product calculate(Product product1, Product product2)

which takes two products as parameters.

The method creates and returns a new product in which the names of the products received as parameters 
are combined with the 'and' word 
and the quantities are added together.



Example of calling the method:
public static void main(String[] args) {
    Product carrot = new Product("Carrot", 5);
    Product potato = new Product("Potato", 7);
    
    Product combined = calculate(carrot, potato);
    System.out.println(combined.getName());
    System.out.println(combined.getAmount());
}



Program outputs:
Carrot and Potato
12









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import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        
         String[] products = {"Blueberry", "Strawberry", "Raspberry", "Grape",
                             "Lingonberry", "Cranberry", "Currant"};
        
        for (int test=0; test<3; test++) {
            String t1 = products[r.nextInt(products.length)];
            String t2 = t1;
            while (t1.equals(t2)) {
                t2 = products[r.nextInt(products.length)];
            }
            
            Product product1 = new Product(t1, r.nextInt(20) + 1);
            Product product2 = new Product(t2, r.nextInt(20) + 1);
            
            System.out.println("Product 1: " + product1);
            System.out.println("Product 2: " + product2);
            
            Product product3 = calculate(product1, product2);
            System.out.println("Names of the berries: " + product3.getName());
            System.out.println("Combined quantity: " + product3.getAmount());
            System.out.println("");
            
        }
    }


    //ADD HERE
    // inside 'Test' class, outside 'main' method
    public static Product calculate(Product product1, Product product2) {
        Product combined = new Product(product1.getName() + " and " + product2.getName(),
                                       product1.getAmount() + product2.getAmount());
        return combined;
    }


}




class Product {
    private String name;
    private int amount;
    
    public Product(String name, int amount) {
        this.name = name;
        this.amount = amount;
    }

    public String getName() {
        return name;
    }

    public int getAmount() {
        return amount;
    }

    @Override
    public String toString() {
        return "Product (name=" + name + ", amount=" + amount + ")";
    }  
}





Product 1: Product (name=Raspberry, amount=7)
Product 2: Product (name=Grape, amount=19)
Names of the berries: Raspberry and Grape
Combined quantity: 26

Product 1: Product (name=Blueberry, amount=20)
Product 2: Product (name=Grape, amount=5)
Names of the berries: Blueberry and Grape
Combined quantity: 25

Product 1: Product (name=Blueberry, amount=20)
Product 2: Product (name=Strawberry, amount=12)
Names of the berries: Blueberry and Strawberry
Combined quantity: 32