62 lines
1.8 KiB
Java
62 lines
1.8 KiB
Java
// generics/BankTeller.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// A very simple bank teller simulation
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import java.util.*;
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import onjava.*;
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class Customer {
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private static long counter = 1;
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private final long id = counter++;
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@Override
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public String toString() { return "Customer " + id; }
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}
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class Teller {
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private static long counter = 1;
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private final long id = counter++;
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@Override
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public String toString() { return "Teller " + id; }
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}
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class Bank {
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private List<BankTeller> tellers = new ArrayList<>();
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public void put(BankTeller bt) { tellers.add(bt); }
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}
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public class BankTeller {
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public static void serve(Teller t, Customer c) {
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System.out.println(t + " serves " + c);
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}
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public static void main(String[] args) {
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// Demonstrate create():
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RandomList<Teller> tellers =
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Suppliers.create(RandomList::new, Teller::new, 4);
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// Demonstrate fill():
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List<Customer> customers = Suppliers.fill(
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new ArrayList<>(), Customer::new, 12);
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customers.forEach(c -> serve(tellers.select(), c));
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// Demonstrate assisted latent typing:
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Bank bank = Suppliers.fill(
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new Bank(), Bank::put, BankTeller::new, 3);
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// Can also use second version of fill():
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List<Customer> customers2 = Suppliers.fill(
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new ArrayList<>(), List::add, Customer::new, 12);
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}
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}
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/* Output:
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Teller 3 serves Customer 1
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Teller 2 serves Customer 2
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Teller 3 serves Customer 3
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Teller 1 serves Customer 4
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Teller 1 serves Customer 5
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Teller 3 serves Customer 6
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Teller 1 serves Customer 7
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Teller 2 serves Customer 8
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Teller 3 serves Customer 9
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Teller 3 serves Customer 10
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Teller 2 serves Customer 11
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Teller 4 serves Customer 12
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*/
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