What characteristics do you use to evaluate the quality of software code?

To assess the quality of programming code, I pay attention to the following characteristics:

• Readability — how easy it is for another developer to understand the code.
• Maintainability — how simple it is to make changes and fix errors.
• Modularity — dividing the code into independent and reusable components.
• Absence of duplication — repetitive code complicates maintenance.
• Testability — the ability to easily write and run automated tests.
• Performance — the code should operate efficiently without unnecessary resource consumption.
• Compliance with standards and conventions — using widely accepted styles and patterns.

An example of simple Java code with good readability and modularity:

public class Calculator {
    public int add(int a, int b) {
        return a + b;
    }

    public int multiply(int a, int b) {
        return a * b;
    }
}

Such code is easy to understand, test, and extend.