private int id;

private String name;

private double price;

public Product(int id, String name, double price) {

this.id = id;

this.name = name;

this.price = price;

}

public int getId() {

return id;

}

public String getName() {

return name;

}

public double getPrice() {

return price;

}

@Override

public int compareTo(Product otherProduct) {

return Double.compare(this.price, otherProduct.price);

}

public static void main(String[] args) {

List<Product> productList = new ArrayList<>();

productList.add(new Product(1, "Laptop", 1200.00));

productList.add(new Product(2, "Smartphone", 800.00));

productList.add(new Product(3, "Headphones", 150.00));

productList.add(new Product(4, "Tablet", 500.00));

productList.add(new Product(5, "Camera", 700.00));

productList.add(new Product(6, "Printer", 300.00));

productList.add(new Product(7, "Mouse", 25.00));

productList.add(new Product(8, "Keyboard", 50.00));

productList.add(new Product(9, "Monitor", 250.00));

productList.add(new Product(10, "External Hard Drive", 120.00));

OptionalDouble sum = productList.stream()

.filter((p) -> p.getPrice() > 500)

.mapToDouble((p) -> p.getPrice())

.average();

productList.stream()

.sorted((p1,p2) -> ((Double)p1.getPrice()).compareTo(p2.getPrice()))

.forEach((p) -> System.out.println(p.getPrice()));

productList.stream()

.sorted()

.forEach((p) -> System.out.println(p.getPrice()));

System.out.println(sum);

}