Why Clean Code Matters: Practical Tips for Naming, Classes, Functions, and Tests

After years of development, the author emphasizes that clean code is crucial, especially in team environments, because elegant and orderly code makes collaboration easier.

1. Why Keep Code Clean?

Unclean code accumulates over time, reducing productivity and leading to hard‑to‑extend code, crashes, overtime, increased company costs, and even potential failure.

1.1 Start Clean from the Beginning

Write clean code from the start; if you encounter messy code, refactor it promptly. Never adopt a "later" mindset. later equal never If you keep postponing, many "later" tasks will be forgotten.

If something must be done, do it early!

1.2 How to Write Clean Code?

Clean code should be highly readable, avoid duplication, and follow design‑pattern principles such as Single Responsibility, Open‑Closed, Liskov Substitution, Dependency Inversion, Interface Segregation, Law of Demeter, and Composite Reuse.

2. Naming

Good naming improves readability, reduces understanding cost, and boosts efficiency.

2.1 Bad Naming Practices

Meaningless names, inconsistent naming, and redundant words hinder comprehension. public interface Animal { void abc(); } The method name abc provides no clue about its purpose. public interface Animal { void cry(); } Renaming to cry makes the intent clear.

Names must be meaningful and self‑explanatory.

public interface StudentRepository extends JpaRepository<AlertAll, String> { Student findOneById(@Param("id") String id); List<Student> queryAllStudent(); }

Inconsistent method names queryAllStudent and findOneById should be unified.

public interface StudentRepository extends JpaRepository<AlertAll, String> { Student findOneById(@Param("id") String id); List<Student> findAll(); }

Redundant naming (e.g., adding Variable or Table suffixes) should be avoided.

// get single object
getXxx();
// get multiple objects
listXxxx();