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Best practices improve code maintainability through design patterns, including: 1. Dependency injection: Injecting dependencies improves testability and reduces coupling. 2. Single responsibility principle: a class is only responsible for one task, improving code readability, maintainability, and scalability. 3. Interface isolation principle: The interface only defines necessary operations to reduce coupling and facilitate maintenance and expansion. 4. Liskov substitution principle: Replacing a base class with a derived class does not affect behavior and enhances flexibility and maintainability. 5. Factory pattern: Separate the responsibility for creating objects and creating classes to improve maintainability and flexibility.
Best practices for design patterns to improve code maintainability
Design patterns are reusable programming solutions , can be applied in different scenarios, aiming to improve the maintainability, readability and reusability of code. Here are some best practices to improve code maintainability:
Dependency Injection (DI)
Single Responsibility Principle (SRP)
Interface Isolation Principle (ISP)
Liskov Substitution Principle (LSP)
Factory Pattern
Practical case
Consider the following code:
class Customer { private int id; private String name; private OrderService orderService; public Customer(int id, String name) { this.id = id; this.name = name; this.orderService = new OrderService(); } public void placeOrder() { orderService.placeOrder(); } }
Question: This class violates SRP because it Responsible for managing customer information and placing orders.
Solution: App DI:
class Customer { private int id; private String name; private OrderService orderService; public Customer(int id, String name, OrderService orderService) { this.id = id; this.name = name; this.orderService = orderService; } public void placeOrder() { orderService.placeOrder(); } }
We improved testability by injecting OrderService
into the Customer
class , reducing the degree of coupling and making the code easier to maintain.
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