Java Factory Pattern: Pros & Cons

Some advantages of the Java Factory Pattern include:

1. Separate the creation and usage of objects, so that clients only need to focus on the interface of the products without worrying about the specific implementation classes.
2. By using factory classes to centrally manage object creation, it is possible to better control and manage the lifecycle of objects.
3. Objects can be reused, avoiding the need to create the same objects repeatedly.
4. It is possible to dynamically switch and expand specific product categories, without the need to modify the client code when adding new product categories.

Disadvantages of the Java Factory pattern include:

1. Increased the complexity of the code, requiring the additional writing of factory classes.
2. When there are many product categories, the factory class will become large and difficult to maintain.
3. Factory classes are typically static or implemented as singleton patterns, which do not support polymorphism and restrict the extension of factory classes.

In general, the Java Factory Pattern is a commonly used design pattern that can enhance code maintainability and extensibility, but it is important to strike a balance between code complexity and maintainability when using it.