import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.ComparatorUtils;
import org.apache.commons.collections4.ListUtils;
import org.apache.commons.collections4.PredicateUtils;
import org.apache.commons.collections4.functors.ComparatorPredicate;
import java.util.ArrayList;
import java.util.List;
public class ProductManager {
private List<Product> productList;
public ProductManager() {
productList = new ArrayList<>();
}
public void addProduct(Product product) {
productList.add(product);
}
public List<Product> getProducts() {
return productList;
}
public List<Product> searchProduct(String keyword) {
return new ArrayList<>(CollectionUtils.select(productList, PredicateUtils.predicateComparator(
new ComparatorPredicate<>(p -> p.getName().contains(keyword))))
);
}
public List<Product> sortProductsByPrice() {
return ListUtils.collate(productList, ComparatorUtils.<Product>naturalComparator());
}
}
public class Product {
private String name;
private double price;
private String description;
private int stock;
public Product(String name, double price, String description, int stock) {
this.name = name;
this.price = price;
this.description = description;
this.stock = stock;
}
}
public class Main {
public static void main(String[] args) {
ProductManager productManager = new ProductManager();
productManager.addProduct(new Product("iPhone 13 Pro", 1299.99, "The latest iPhone model", 100));
productManager.addProduct(new Product("Samsung Galaxy S21", 1099.99, "Premium Android smartphone", 50));
productManager.addProduct(new Product("Sony PlayStation 5", 499.99, "Next-generation gaming console", 200));
List<Product> searchResults = productManager.searchProduct("iPhone");
for (Product product : searchResults) {
System.out.println(product.getName());
}
List<Product> sortedList = productManager.sortProductsByPrice();
for (Product product : sortedList) {
System.out.println(product.getName() + " - " + product.getPrice());
}
}
}
