Table of Contents

Factory Method Pattern

하위 클래스에서 인스턴스 작성

, , ,

인스턴스 생성을 위한 Framework(골격) 측

package framework;

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


package framework;

/* 가장 핵심 부분! */
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);
}

구체적인 구현하고 있는 측

package product;

import framework.Product;

public class IDCard extends Product {

	private String owner;
	public IDCard(String owner) {
		this.owner = owner;
	}
	
	@Override
	public void use() {
		System.out.println(owner + "의 카드 사용");
	}
	
	public String getOwner() {
		return this.owner;
	}
}


package product;

import java.util.ArrayList;
import java.util.List;

import framework.Factory;
import framework.Product;

public class IDCardFactory extends Factory {

	private List<String> owners = new ArrayList<>();
	
	@Override
	protected Product createProduct(String owner) {
		return new IDCard(owner);
	}

	@Override
	protected void registerProduct(Product product) {
		if(!(product instanceof IDCard))
			return;
		
		owners.add(((IDCard) product).getOwner());
	}
}

Client

import framework.*;
import product.*;

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

/*
철수의 카드 사용
영희의 카드 사용
*/