Javaフレームワークにおけるファクトリパターンの適用シナリオは何ですか?

// 工厂类
public class BeanFactory {

    public Bean createBean(String beanType) {
        switch (beanType) {
            case "A":
                return new BeanA();
            case "B":
                return new BeanB();
            default:
                throw new IllegalArgumentException("Invalid bean type: " + beanType);
        }
    }
}

// Bean 接口
interface Bean {
    void doSomething();
}

// Bean A 实现
class BeanA implements Bean {
    @Override
    public void doSomething() {
        System.out.println("Bean A doing something");
    }
}

// Bean B 实现
class BeanB implements Bean {
    @Override
    public void doSomething() {
        System.out.println("Bean B doing something");
    }
}

// 主类
public class Main {

    public static void main(String[] args) {
        BeanFactory factory = new BeanFactory();
        
        // 使用工厂创建 bean 对象
        Bean beanA = factory.createBean("A");
        beanA.doSomething(); // 输出：Bean A doing something

        Bean beanB = factory.createBean("B");
        beanB.doSomething(); // 输出：Bean B doing something
    }
}