Factory範例圖 by shumi

List1 Product類別

package framework;

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

List2 Factory類別

package framework;

public abstract class Factory{

   private Product lnkProduct;

   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);

}

List3 IDCard類別

package idcard;
import framework.*;

public class IDCard extends Product{
   private String owner;

   IDCard(String owner){
      System.out.println("建立" + owner + "的卡。");
      this.owner = owner;
   }

   public void use(){
      System.out.println("使用" + owner + "的卡。");
   }

   public String getOwner(){
      return owner;
   }
}

List4 IDCardFactory類別

package idcard;
import framework.*;
import java.util.*;

public class IDCardFactory extends Factory{

   private IDCard lnkIDCard;
   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;
   }

}

List5 Main類別

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("戶村");
      Product card3 = factory.create("佐藤花子");
      card1.use();
      card2.use();
      card3.use();
   }
}