工厂模式:如何从客户端访问具体产品类的属性？

// 产品接口
interface Product {
    void doSomething();
}

// 具体产品类A
class ConcreteProductA implements Product {
    private String propertyA;

    public ConcreteProductA(String propertyA) {
        this.propertyA = propertyA;
    }

    public void doSomething() {
        System.out.println("ConcreteProductA: " + propertyA);
    }
}

// 具体产品类B
class ConcreteProductB implements Product {
    private int propertyB;

    public ConcreteProductB(int propertyB) {
        this.propertyB = propertyB;
    }

    public void doSomething() {
        System.out.println("ConcreteProductB: " + propertyB);
    }
}

// 工厂类
class Factory {
    public Product createProduct(String type) {
        if (type.equals("A")) {
            return new ConcreteProductA("Property A");
        } else if (type.equals("B")) {
            return new ConcreteProductB(123);
        }
        return null;
    }
}

// 客户端代码
public class Client {
    public static void main(String[] args) {
        Factory factory = new Factory();
        Product productA = factory.createProduct("A");
        Product productB = factory.createProduct("B");

        productA.doSomething();  // 输出：ConcreteProductA: Property A
        productB.doSomething();  // 输出：ConcreteProductB: 123
    }
}