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61 lines (58 loc) · 1.76 KB
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//: generics/BankTeller.java
package generics; /* Added by Eclipse.py */
// A very simple bank teller simulation.
import java.util.*;
import net.mindview.util.*;
class Customer {
private static long counter = 1;
private final long id = counter++;
private Customer() {}
public String toString() { return "Customer " + id; }
// A method to produce Generator objects:
public static Generator<Customer> generator() {
return new Generator<Customer>() {
public Customer next() { return new Customer(); }
};
}
}
class Teller {
private static long counter = 1;
private final long id = counter++;
private Teller() {}
public String toString() { return "Teller " + id; }
// A single Generator object:
public static Generator<Teller> generator =
new Generator<Teller>() {
public Teller next() { return new Teller(); }
};
}
public class BankTeller {
public static void serve(Teller t, Customer c) {
System.out.println(t + " serves " + c);
}
public static void main(String[] args) {
Random rand = new Random(47);
Queue<Customer> line = new LinkedList<Customer>();
Generators.fill(line, Customer.generator(), 15);
List<Teller> tellers = new ArrayList<Teller>();
Generators.fill(tellers, Teller.generator, 4);
for(Customer c : line)
serve(tellers.get(rand.nextInt(tellers.size())), c);
}
} /* Output:
Teller 3 serves Customer 1
Teller 2 serves Customer 2
Teller 3 serves Customer 3
Teller 1 serves Customer 4
Teller 1 serves Customer 5
Teller 3 serves Customer 6
Teller 1 serves Customer 7
Teller 2 serves Customer 8
Teller 3 serves Customer 9
Teller 3 serves Customer 10
Teller 2 serves Customer 11
Teller 4 serves Customer 12
Teller 2 serves Customer 13
Teller 1 serves Customer 14
Teller 1 serves Customer 15
*///:~