OnJava8-Examples/generics/Store.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/Store.java

// 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;

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> {

Shelf(int nProducts) {

Suppliers.fill(this, Product.generator, nProducts);

}

class Aisle extends ArrayList<Shelf> {

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(5, 4, 3));

}

/* 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

...

OnJava8-Examples/generics/Store.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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