Classification of Java Code refactoring

Decomposing classification is a refactoring technique that aims to split a large and complex class into multiple small and simple classes, each responsible for a specific responsibility or function. Doing so can improve the readability, maintainability, and scalability of the code. The following is an example code that requires the use of split class refactoring: public class Order { private String orderId; private String customerName; private String customerEmail; private List<Product> products; private double total; // constructor, getters, setters, etc. public void processOrder() { //Processing Order Logic } public void sendConfirmationEmail() { //Send confirmation email logic } public void calculateTotal() { //Logic for calculating total order amount } } In this example code, the Order class takes on too much responsibility, responsible for both the order processing logic and sending confirmation emails and calculating the total order amount. This leads to the Order class becoming large and complex, which does not comply with the Single Responsibility Principle (SRP). To improve this issue, the Order class can be divided into three subcategories: public class Order { private String orderId; private String customerName; private String customerEmail; private List<Product> products; // constructor, getters, setters, etc. } public class OrderProcessor { public void processOrder(Order order) { //Processing Order Logic } } public class OrderMailer { public void sendConfirmationEmail(Order order) { //Send confirmation email logic } } public class OrderCalculator { public double calculateTotal(Order order) { //Logic for calculating total order amount } } By splitting and categorizing, each class is only responsible for specific functions, making the code clearer and more maintainable. The Order class only retains the attributes of the order, while the specific processing, email sending, and total calculation logic have been moved to the corresponding split class. The code after splitting and refactoring can be more easily modified and extended for functionality. For example, if you need to change the order processing logic or send confirmation email logic, you only need to modify the corresponding sorting without affecting other functions. At the same time, it also improves the Testability of the code, because the function of each class is single, it is more convenient to conduct unit testing. In short, classification is a refactoring technique that helps improve code readability, maintainability, and scalability, suitable for situations where classes become large and complex, and take on too much responsibility.