Nested classes – Java advanced (OCP)
A nested class is a class written inside another, in order to prevent outside classes to access it or use…
Class design – OOP | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
This article is probably to be read together with the one on methods in Java OOP. There is a lot…
Methods – OOP | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
Certification and technical interviews will check if you know your OOP principles and can apply them. In the associate level…
Passing the 1Z0-819 Oracle Certified Professional Java SE 11: preparation and exam experience
In this article I’ll explain how I passed the 1Z0-819 Oracle Certified Professional Java SE 11: the level and experience…
Date and Time in Java 8+ | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
Since Java 8, the java.util.Date class is deprecated and new package java.time was introduced. Even though the old Date class…
Wrapper classes | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
Wrapper classes are reference types that allow to manipulate primitives as so. They are thus nullable, and are necessary to…
Array and ArrayList | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
Arrays are a very important structure in a programming language. In this article I’ll talk about arrays ([ ]) and…
String and StringBuilder | Preparing for Java Oracle Associate Certification (OCA) / Java basic technical tests
String and StringBuilder classes don’t work the same at all. Here are the differences between them as well as gotcha’s…