89 lines
2.2 KiB
Java
89 lines
2.2 KiB
Java
// generics/Store.java
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
// Building a complex model using generic collections
|
|
import java.util.*;
|
|
import java.util.function.*;
|
|
import onjava.*;
|
|
|
|
class Product {
|
|
private final int id;
|
|
private String description;
|
|
private double price;
|
|
public
|
|
Product(int idNumber, String descr, double price) {
|
|
id = idNumber;
|
|
description = descr;
|
|
this.price = price;
|
|
System.out.println(toString());
|
|
}
|
|
@Override
|
|
public String toString() {
|
|
return id + ": " + description + ", price: $" + price;
|
|
}
|
|
public void priceChange(double change) {
|
|
price += change;
|
|
}
|
|
public static Supplier<Product> generator =
|
|
new Supplier<Product>() {
|
|
private Random rand = new Random(47);
|
|
@Override
|
|
public Product get() {
|
|
return new Product(rand.nextInt(1000), "Test",
|
|
Math.round(rand.nextDouble() * 1000.0) + 0.99);
|
|
}
|
|
};
|
|
}
|
|
|
|
class Shelf extends ArrayList<Product> {
|
|
public Shelf(int nProducts) {
|
|
Suppliers.fill(this, Product.generator, nProducts);
|
|
}
|
|
}
|
|
|
|
class Aisle extends ArrayList<Shelf> {
|
|
public Aisle(int nShelves, int nProducts) {
|
|
for(int i = 0; i < nShelves; i++)
|
|
add(new Shelf(nProducts));
|
|
}
|
|
}
|
|
|
|
class CheckoutStand {}
|
|
class Office {}
|
|
|
|
public class Store extends ArrayList<Aisle> {
|
|
private ArrayList<CheckoutStand> checkouts =
|
|
new ArrayList<>();
|
|
private Office office = new Office();
|
|
public Store(int nAisles, int nShelves, int nProducts) {
|
|
for(int i = 0; i < nAisles; i++)
|
|
add(new Aisle(nShelves, nProducts));
|
|
}
|
|
@Override
|
|
public String toString() {
|
|
StringBuilder result = new StringBuilder();
|
|
for(Aisle a : this)
|
|
for(Shelf s : a)
|
|
for(Product p : s) {
|
|
result.append(p);
|
|
result.append("\n");
|
|
}
|
|
return result.toString();
|
|
}
|
|
public static void main(String[] args) {
|
|
System.out.println(new Store(14, 5, 10));
|
|
}
|
|
}
|
|
/* Output: (First 8 Lines)
|
|
258: Test, price: $400.99
|
|
861: Test, price: $160.99
|
|
868: Test, price: $417.99
|
|
207: Test, price: $268.99
|
|
551: Test, price: $114.99
|
|
278: Test, price: $804.99
|
|
520: Test, price: $554.99
|
|
140: Test, price: $530.99
|
|
...
|
|
*/
|