Java 101 for software testing (Using fruits and vehicle as example)

I think many of you might have similar experience like me where I found myself struggle to understand of Java language.

There was a time I try to avoid myself from writing selenium testing script in Java, instead, I'm using Python to code.

And when I decided to learn and write selenium testing script using java but I'm devastated because of the endless of error seem to appear.. I can't understand the error log, the console log and etc. And I knew that was because lack of basic understanding of Java language.

Hence, I strongly recommend you to read this article before you write any selenium test scripts because you must build your foundation right before you write any scripts.

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First, we ask WHY ? Why Java ?

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✅ Java is a programming language that is commonly used in combination with the Selenium web automation tool.

✅ Selenium is a powerful tool for automating web browsers, and it can be used to automate a wide variety of web-based tasks.

✅ When used with Java, Selenium allows developers to write automated tests for web applications using the Java programming language.

✅ This can be useful for a variety of purposes, including functional testing, performance testing, and regression testing. Not only that, selenium has a number of libraries that can be used to extend its functionality or make it easier to use in certain situations.

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Next, what is Java ?

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✅ Java is an object-oriented programming (OOP) language.

You may wonder what is OOP means ? Don't freak out.

Let me make this simple for you. For example:
Fruits.

There are bananas, cherries, oranges, kiwis, grapes and apples in the picture.

✅ These are called Objects.
✅ And what are they categories as ? Fruits

Hence, Fruits is the Class and bananas, cherries, oranges, kiwis, grapes and apples is the Objects.

Is this sound simple ?

What about this picture ?

We can see trucks , ambulance, bus and car.

And what are they ? Vehicles

So we know Vehicles is Class and trucks , ambulance , bus and car is an Object.

Now, what is the color of the car ? Blue

Blue is the attribute of the Car.

How do we operate the vehicles ? Drive

Drive is the method

We can conclude 4 things from this , we know the class (vehicles), the object (car, bus, trucks, ambulance), attributes (blue, 4 tires , etc) and method (drive).

public class Vehicle { <- this is class = vehicles

String carBrand = honda; <- this is objects and attributes
Int numOfTires = 4; <- this is objects and attributes

void Drive(){ <- this is drive method
System.out.print("Car is driving");
}

public static void main(String[]args){

Car myCar = new Car();

myCar.drive();

This is just a simple java program to show you how the java structure it is. It's OK not to understand everything in the first place. Just get along with me , and I can assure you will have sufficient java knowledge to write your first selenium script with Java.

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