图解设计模式-factory Method模式

public abstract class Factory {

    public final Product create(String owner) {
        Product product = createProduct(owner);
        register(product);
        return product;
    }

    public abstract Product createProduct(String owner);
    public abstract void register(Product product);
}

public abstract class Product {

    public abstract void use();
}

public class IDCard extends Product {
    private String owner;

    public IDCard(String owner) {
        System.out.println("创建"+owner+"的ID卡");
        this.owner=owner;
    }
    @Override
    public void use() {
        System.out.println("使用"+owner+"的ID卡");
    }

    public String getOwner(){
        return owner;
    }
}

public class IDCardFactory extends Factory {
    List owners = new ArrayList<>();

    @Override
    public Product createProduct(String owner) {
        return new IDCard(owner);
    }

    @Override
    public void register(Product product) {
        owners.add(((IDCard)product).getOwner());
    }
}

public class Main {
    public static void main(String[] args){
        Factory factory = new IDCardFactory();
        Product product1= factory.create("s1");
        Product product2= factory.create("s2");
        Product product3= factory.create("s3");
        product1.use();
        product2.use();
        product3.use();
    }
}