When should you avoid using Java functions?

The situations where Java functions should be avoided include: 1. Too deep nesting; 2. Too many parameters; 3. The function body is too long; 4. It is difficult to refactor; 5. The readability is poor.

When to avoid using Java functions

When to avoid using Java functions

In Java, Sometimes functions can get in the way of code readability and maintainability. Here are some situations where you should avoid using functions:

• Nesting too deeply: When functions are nested too much, the code becomes difficult to understand.
• Too many parameters: Too many parameters will make the function signature difficult to remember and understand.
• The function body is too long: A function body that is too long is difficult to read and maintain.
• Difficult to refactor: If the function coupling is too high, it may be difficult to refactor the function.
• Poor readability: When the function name is not descriptive or the logic of function execution is difficult to understand.

Practical case

The following are code examples where functions should not be used:

public class Example {

    private int calculate(int a, int b, int c, int d, int e, int f, int g, int h) {
        return a + b - c * d / e + f - g * h;
    }

}

The above function is nested too deeply, has too many parameters, and the function body is too long . This is a poor example that is difficult to understand and maintain.

After rewriting:

public class Example {

    private int sum(int a, int b) {
        return a + b;
    }

    private int difference(int a, int b) {
        return a - b;
    }

    private int product(int a, int b) {
        return a * b;
    }

    private int quotient(int a, int b) {
        return a / b;
    }

    public int calculate(int a, int b, int c, int d, int e, int f, int g, int h) {
        return sum(a, b) - difference(c, quotient(d, e)) + difference(f, product(g, h));
    }

}

The rewritten code improves readability and maintainability by decomposing complex calculations into smaller functions.

Conclusion

In Java, careful use of functions can improve the readability and maintainability of your code. Avoid functions that are too deeply nested, have too many parameters, have too long function bodies, are difficult to refactor, and have poor readability.

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