Lære KISS in Practice | Fundamental Coding Principles

KISS Principle Overview

The KISS principle stands for Keep It Simple, Stupid. This concept encourages you to write code that is straightforward, clear, and easy to understand. By avoiding unnecessary complexity, you make your Java programs easier to read, debug, and maintain.

Applying the KISS principle helps you:

Reduce the chance of bugs and errors;
Make code more accessible for other developers;
Simplify future updates and enhancements;
Improve overall project quality.

Focusing on simplicity ensures your Java code remains robust and maintainable as your projects grow.

Real-World Development Example

Imagine you are building a simple calculator in Java. Instead of creating a complex class with unnecessary features or overcomplicated logic, you keep the design straightforward by providing only the essential methods (add and subtract). This simple and clear approach makes the code easy to read, understand, and maintain, demonstrating the KISS principle in practice.

SimpleCalculator.java


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package com.example;

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

    public int subtract(int a, int b) {
        return a - b;
    }

    public static void main(String[] args) {
        SimpleCalculator calculator = new SimpleCalculator();
        int sum = calculator.add(5, 3);
        int difference = calculator.subtract(10, 4);
        System.out.println("Sum: " + sum);
        System.out.println("Difference: " + difference);
    }
}

In the provided code example, you see a simple Java program that calculates the sum of two numbers and prints the result. Here’s what happens in the code:

The code starts with the package com.example; declaration, organizing the file into a named package;
The public class SimpleSum defines a class named SimpleSum that contains the program logic;
Inside the class, the public static void main(String[] args) method serves as the program’s entry point;
Two integer variables, a and b, are declared and assigned values;
The sum of a and b is calculated and stored in the variable sum;
The result is printed to the console using System.out.println.

This code strictly follows the KISS (Keep It Simple, Stupid) principle:

Each step is clear and easy to understand;
Variable names are descriptive and direct;
There is no unnecessary logic, extra methods, or complex structures;
The code accomplishes its task with minimal lines and straightforward flow.

By keeping the logic simple and avoiding overcomplication, the code is easy to read, maintain, and debug. This approach reduces the risk of errors and makes it easier for others (and your future self) to understand what the program does.

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