Factory Methodパターン

code:framework.Product.java

package framework;

public abstract class Product {

public abstract void use();

}

code:framework.Factory.java

package framework;

public 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);

}

code:idcard.IDCard.java

package idcard;

import framework.*;

public class IDCard extends Product {

private String owner;

IDCard(String owner) {

System.out.println(owner + "のカードを作ります。");

this.owner = owner;

}

public void use() {

System.out.println(owner + "のカードを使います。");

}

public String getOwner() {

return owner;

}

}

code:idcard.IDCardFactory.java

package idcard;

import framework.*;

import java.util.*;

public class IDCardFactory extends Factory {

private List owners = new ArrayList();

protected Product createProduct(String owner) {

return new IDCard(owner);

}

protected void registerProduct(Product product) {

owners.add(((IDCard)product).getOwner());

}

public List getOwners() {

return owners;

}

}

code:Main.java

import framework.*;

import idcard.*;

public class Main {

public static void main(String[] args) {

Factory factory = new IDCardFactory();

Product card1 = factory.create("結城浩");

Product card2 = factory.create("とむら");

Product card3 = factory.create("佐藤花子");

card1.use();

card2.use();

card3.use();

}

}