Understanding OOP Concepts: Properties and Methods

In part 1, we’ve learned about OPP, Class & Object. Today I’m trying to explain properties and methods. Let’s get started:

Table of Contents

  1. Properties
  2. Methods
  3. Example
  4. Example in Java


A property is an attribute of an object. We can also say the variables inside a class are called properties.


A function inside a class is called a method. A method is an action that an object can perform.


Let’s assume a Car class. I’m writing some possible properties and objects of the Car class.

Class: Car
Object: BMW i8, Tesla 3, Audi a3
Properties: Brand, Color, SunRoof
Methods: Horn, Steering

This figure helps us to get a clear idea:

Figure is taken from learnqtp.com

Example in Java

Now let’s try to write the code of Car class:

public class Car {
    // properties
    String brand;
    String color;
    Boolean hasSunRoof = true;

    // method
    void horn() {

    // method
    void steering() {
        System.out.println("Move the car...!\n");

    // method
    void displayInfo() {
        String sunRoof;

        if (hasSunRoof)
            sunRoof = "has Sunroof";
            sunRoof = "doesn't have Sunroof";

        System.out.println("Car brand is " + brand + ". It's color is " + color + " and " + sunRoof);

We’ve written the Car class code. Let’s try to create objects and display information:

public class AnotherClass {
    public static void main(String[] arg) {
        // object bmw
        Car bmw = new Car();
        bmw.brand = "BMW i8";
        bmw.color = "Black";

        // object audi
        Car audi = new Car();
        audi.brand = "Audi a3";
        audi.color = "Red";

In the next article, I’ll try to explain constructor & destructor.

Software Engineer | Ethical Hacker & Cybersecurity...

Md Obydullah is a software engineer and full stack developer specialist at Laravel, Django, Vue.js, Node.js, Android, Linux Server, and Ethichal Hacking.