- 25 July 2018 7:22
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- 22 July 2018 7:21
- 21 July 2018 11:26Methods, method parameters, interaction and overloadingHello again! In the last lesson we got acquainted with classes and constructors, and learned how to create our own. Today we will become better acquainted with methods, an essential part of classes. A method is a set of commands which allow you to perform a specific operation in a program ...
- 21 July 2018 10:44Getting started with classes: writing your own classes, constructorsHi! Today we will talk about classes in Java. You could say that classes form the cornerstone of Java programming. When you become a programmer, nearly your entire job will be writing your own classes that have various functions. Let's ...
- 21 July 2018 10:02Wrappers, unboxing, and boxingHi! You are already well acquainted with primitive types, and have worked quite a bit with them. In programming (and Java in particular), primitives have many advantages: they use little memory (and thus make the program more efficient) and have a clearly delineated range of values ...
- 21 July 2018 7:21
- 20 July 2018 15:33instanceof and Inheritance 101 Hi! In previous lessons, we've already briefly become acquainted with the concept of inheritance. Today, we'll touch on this topic again, but again not too deeply. We are still going to have a more detailed lesson on this in the future. Today we'll just take a quick look at a few practical examples and get ...
- 20 July 2018 15:00Fixed values in Java: final, constants, and immutableHi! You're already familiar with the word "modifier". At a minimum, you've encountered access modifiers (public, private) and the static modifier. Today we'll discuss a special modifier called final. You could say the final modifier "cements" parts of our program where constant, unambiguous, unchanging behaviors ...
- 20 July 2018 14:31Widening and narrowing of primitive typesHi! As you have progressed through CodeGym, you've encountered primitive types many times. Here is a short list of what we know about them: they are not objects and represent a value stored in memory, there are several kinds, each type has its own range of values ...
- 20 July 2018 13:49Exceptions: checked, unchecked, and customHi! In the last lesson, we got acquainted with exceptions in the Java language, and saw examples of how to work with them. Today we will take a deeper look at the structure of exceptions, and learn how to write our own exceptions. :) As we said previously, there are a lot of exceptions in Java, almost 400 ...
- 20 July 2018 13:29Exceptions: catching and handlingHi! I hate to mention it, but a huge part of a programmer's work is dealing with errors. Most often, his or her own. It turns out that there are no people who don't make mistakes. And there are no such programs either. Of course, when dealing with an error, the main thing is to understand its cause ...