#format java

/** 
 * FactoryMethodPattern Example
 */

import java.util.*;

abstract class Product {
    public abstract void use();
}

abstract class Factory {
    public final Product create(String owner) {
        Product p = createProduct(owner);
        registerProduct(p);
        return p;
    }
    protected abstract Product createProduct(String owner);
    protected abstract void registerProduct(Product product);
}

class IDCard extends Product {
    private String owner;
    IDCard(String owner) {
        System.out.println(owner+"'s card making");
        this.owner = owner;
    }
    public void use() {
        System.out.println(owner+"'s card using");
    }
    public String getOwner() {
        return owner;
    }
}

class IDCardFactory extends Factory {
    private Vector owners = new Vector();
    protected Product createProduct(String owner) {
        return new IDCard(owner);
    }
    protected void registerProduct(Product product) {
        owners.add(((IDCard)product).getOwner());
    }
    public Vector getOwners() {
        return owners;
    }
}

public class FactoryMethodIdCard {
    public static void main(String[] args) {
        Factory factory = new IDCardFactory();
        Product card1 = factory.create("Jane");
        Product card2 = factory.create("Bob");
        card1.use();
        card2.use();
    }
}