import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.Set;

/**
 * {@link <a href=
 * "https://[Log in to view URL]"
 * target= "_blank"></a>}
 * 
 * @author itammb ( Italia Massimiliano Buscati )
 * @version JDK 1.15
 *
 */
class Main {
	private static class Product {
		private int id;
		private String name;
		private float price;

		@Override
		public String toString() {
			return "Product [id=" + id + ", name=" + name + ", price=" + price + "]";
		}

		private Product(int id, String name, float price) {
			this.id = id;
			this.name = name;
			this.price = price;
		}
	}

	private static class UniTest {
		/**
		 * @see Stream#map(java.util.function.Function)
		 * @see Stream#collect(java.util.stream.Collector)
		 * @see Collectors#toSet()
		 *
		 */
		public void converting_list_to_set(List<Product> source) {
			// rimozione elementi duplicati
			Set<Float> prise = source.stream().map(p -> p.price).collect(Collectors.toSet());
			System.out.println(prise);
		}

		/**
		 * @see Collectors#toMap(java.util.function.Function,
		 *      java.util.function.Function)
		 *
		 */
		public void converting_list_to_map(List<Product> source) {
			Map<Integer, String> prise = source.stream().collect(Collectors.toMap(p -> p.id, p -> p.name));
			System.out.println(prise);
		}

		public static List<Product> createTest() {
			// elementi in serie
			return new ArrayList<Product>() {
				private static final long serialVersionUID = -69L;

				{
					add(new Product(1, "HP Laptop", 25000f));
					add(new Product(2, "Dell Laptop", 30000f));
					add(new Product(3, "Lenevo Laptop", 28000f));
					add(new Product(4, "Sony Laptop", 28000f));
					add(new Product(5, "Apple Laptop", 90000f));
				}
			};
		}
	}

	public static void main(String args[]) {
		// Unit test - struttura senza elementi duplicati
		new UniTest().converting_list_to_set(UniTest.createTest());
		// Unit test - struttura [chiave, valore]
		new UniTest().converting_list_to_map(UniTest.createTest());
	}
}