Can you name the main principles of writing understandable and maintainable code?

Principles of writing understandable and maintainable code:

• Readability: use clear names for variables, methods, and classes, and write code that is easy to understand without additional context.
• Simplicity: avoid unnecessary complexity, divide logic into small methods and classes.
• Consistency: adhere to a unified coding style and project conventions.
• Documentation: add comments where the logic may not be obvious, use JavaDoc to describe public methods.
• Modularity: structure code so that changes in one part minimally affect others.
• Testability: write code that is easy to cover with tests, facilitating support and development.

Example:

// Bad example
int a = 5;
int b = 10;
int c = a + b;

// Good example
int numberOfUsers = 5;
int maxUsers = 10;
int totalUsers = numberOfUsers + maxUsers;