Page 60 | Java Blog - Java News and Learning posts on CodeGym

Volodymyr Portianko Java Developer
20 July 2018 13:49
Exceptions: checked, unchecked, and custom Hi! 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 ...
20.07.2018
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Oleksandr Miadelets Java Developer
20 July 2018 13:29
Exceptions: catching and handling Hi! 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 ...
20.07.2018
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Oleksandr Miadelets Java Developer
20 July 2018 12:27
Method declaration Hi! You've already known about creating your own classes with fields and methods. Now we'll dwell on methods. Of course, we've already done this more than once in our lessons, but we've mainly covered generalities. Today, we're going to dissect methods, and study what they're made of ...
20.07.2018
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Milan Vucic Java Developer
20 July 2018 11:58
How not to get lost in time: DateTime and Calendar Hi! Today we'll start working with a new data type we haven't encountered before, namely, dates. I don't think I need to explain what a date is. :) In principle, we could store the current date and time in an ordinary Java String. But this approach has many drawbacks. The String class is designed to work with text ...
20.07.2018
30683views
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Jesse Haniel Java Developer
20 July 2018 9:40
Collections class in Java Hi! In the past few lessons, we've made great progress in our mastery of ArrayList. However, so far we've only performed the simplest operations: remove, insert, and display. Of course, this doesn't cover the full list of tasks that developers must perform when working with ArrayList ...
20.07.2018
15269views
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Oleksandr Miadelets Java Developer
20 July 2018 8:53
ArrayList in pictures Hi! Today's lesson about ArrayList will be both easier and harder than previous lessons. It will be more difficult because today we're going to look under the hood of ArrayList and study what happens during various operations. On the other hand, this lesson will have almost no code ...
20.07.2018
17893views
55comments
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Volodymyr Portianko Java Developer
20 July 2018 7:30
Deleting an element from an ArrayList Hi! In the last lesson, we got acquainted with the ArrayList class, and learned how to perform the most common operations with this class. In addition, we pointed out several differences between an ArrayList and an ordinary array. But we skirted one topic, namely, how to delete elements from an ArrayList ...
20.07.2018
22887views
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CodeGym Java Developer
20 July 2018 7:20
Old Level 04 Old Level 04
20.07.2018
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CodeGym Java Developer
20 July 2018 7:20
Old Level 03 Old Level 03
20.07.2018
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Volodymyr Portianko Java Developer
19 July 2018 13:26
Something about arrays Hi! Previously in your training, we've worked with single objects (and primitive types). But what if we need to work with a whole group of objects instead of just one? For example, say we want to create a list of birthdays of all employees at our company. We'll benefit from a special data structure called an array ...
19.07.2018
18324views
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Milan Vucic Java Developer
19 July 2018 12:22
More about the garbage collector Hi! In the last lesson, we first became acquainted with Java's built-in garbage collector and got a rough idea of how it works. It works in the background while your program is running, collecting unnecessary objects that will be deleted later. Thus, it frees up memory that can be used to create new objects in the future ...
19.07.2018
27177views
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John Selawsky Java Developer
19 July 2018 12:04
Object lifecycle Hi! I think you wouldn't be very surprised if I told you that your computer has a limited amount of memory :) Even your hard drive (which is many, many times the size of RAM) can get chock full of your favorite games, TV shows, and other things. To prevent this from happening, you need to monitor the current state ...
19.07.2018
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