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Store.java
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81 lines (65 loc) · 1.76 KB
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package thinkinginjava.generics;
// Building up a complex model using generic containers.
import java.util.ArrayList;
import java.util.Random;
import thinkinginjava.util.Generator;
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());
}
public String toString() {
return id + ": " + description + ", price: $" + price;
}
public void priceChange(double change) {
price += change;
}
public static Generator<Product> generator = new Generator<Product>() {
private Random rand = new Random(47);
public Product next() {
return new Product(rand.nextInt(1000), "Test", Math.round(rand
.nextDouble() * 1000.0) + 0.99);
}
};
}
class Shelf extends ArrayList<Product> {
public Shelf(int nProducts) {
Generators.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<CheckoutStand>();
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));
}
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));
}
}