What is a package? The potato asked me yesterday: what actually is a package? Let's take a look at the project: In your *.java file, you also have the package blog.jumpstart.learningPath defined: The package represents a real system folder. They are created in the source folders. When you check the file properties (Right click on file… Continue reading Polish apples in Russia: what’s the package (in Java)?
But Calculator's attributes have no keyword! In last adventure, I told you that you can use the public keyword in class declaration or before every class member: attribute and method. When something is public it's known everywhere. You've seen public class and public methods. Then you looked at the code and you've noticed: And you… Continue reading Getting lost on the trail: what when there’s no keyword?
Here's the video with quick summary of last week adventures 🙂
Java is powerful. You can do many things with Java. Java is ugly too. Really. You don't want to use Java to write the part of the application that your user will see. That part is called UI - User Interface or GUI - Graphical User Interface. That's why I started with tests. You can… Continue reading Potato wants to use a calculator
New Project: Potato Coding Adventure I've started a new project this week. I wrote about it here. My friend (we call her The Potato) and I decided, however, that we want to write the blog together. That's why it's the last post in Java Learning Path in the Jump Start Blog. I'll be leading the… Continue reading Join Potato Coding Adventure!
When I studied electronics everyone was using scientific calculator made by Casio. It model was fx350ES PLUS. Every second person had the same one. Like a real object has its own characteristics, so does Java Objects. Those characteristics are called attributes. The Calculator class you already know also has attributes describing it such as model or a producer:… Continue reading Inside the hut: class attributes
What are Methods? As I wrote in previous chapter methods do things. The method is a piece of code that has a name and can be used in various places of your program. After method finishes its task it can return a result. Let's take a look at the well-known method add: The method above… Continue reading Inside the hut: methods
Object Oriented Programming In Java, you can write code that represents real objects. It's called OOP = Object Oriented Programming. If the programming is object oriented it must have objects. You object is a calculator. In real life, you also have an object that is known as a calculator. Object Objects in Java can easily map to… Continue reading First hut on the trail: Basics of Object Oriented Programming (OOP)
In your Calculator project you have two java files: Calculator.java in src/main/java where you will write the calculations CalculatorTest.java in src/test/java that you will use to test the code written in Calculator.java Write some code Open Calculator.java. You can see a code needed to write some functions of the calculator inside: add, subtract, multiply etc. It is… Continue reading Going up: let's write some code!
You have the code. What now? I know it may be overwhelming. You did a couple of steps and you may not be sure why. I was like this once too. I still remember when I was asked to set up my first software project at my first job. I got access to SVN (a… Continue reading Second step: let's take a look at Java Project