图解设计模式（四）工厂模式

package com.design;

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

public class TestFactory {
	public static void main(String[] args) {
		Factory factory = new IDCardFactory();
		Product card1 = factory.create("小明");
		Product card2 = factory.create("小红");
		Product card3 = factory.create("小刚");
		card1.use();
		card2.use();
		card3.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);
}

abstract class Product {
	abstract void use();
}

class IDCard extends Product {
	private String owner;
	public IDCard (String owner) {
		this.owner = owner;
		System.out.println("制作" + owner + "的ID卡。");
	}
	@Override
	void use() {
		System.out.println("使用" + owner + "的ID卡。");
	}
	public String getOwner() {
		return owner;
	}
}

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