Page 56 | Java Blog - Java News and Learning posts on CodeGym

Volodymyr Portianko Java Developer
22 March 2019 15:11
Externalizable interface in Java Hi! Today we'll continue to get to know serialization and deserialization of Java objects. In the last lesson, we got to know the Serializable marker interface, reviewed examples of its use, and also learned how you can use the transient keyword to control the serialization process...
22.03.2019
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Volodymyr Portianko Java Developer
22 March 2019 13:39
Managing threads. The volatile keyword and the yield() method Hi! We continue our study of multithreading. Today we'll get to know the volatile keyword and the yield() method. Let's dive in :) When creating multithreaded applications, we can run into two serious problems. First, when a multithreaded application is running, different threads can cache ...
22.03.2019
7564views
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Professor Hans Noodles Java Developer
22 March 2019 13:01
Thread synchronization. The synchronized operator Hi! Today we'll continue to consider the features of multithreaded programming and talk about thread synchronization. What is 'synchronization'? Outside of the programming domain, it implies an arrangement that allows two devices or programs to work together. For example, a smartphone and computer...
22.03.2019
9312views
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Professor Hans Noodles Java Developer
22 March 2019 12:00
Multithreading: What the methods of the Thread class do Hi! Today we'll continue to talk about multithreading. Let's examine the Thread class and what a few of its methods do. When we studied class methods previously, we usually just wrote this: -> . This won't work with Thread's methods :) ...
22.03.2019
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Pavlo Plynko Java Developer
21 March 2019 15:33
Sequence of actions during object creation Hi! Today's lesson will be quite... uh... multifaceted :) in the sense that we will cover a wide range of topics, but they will all relate to the object creation process. We will analyze it from beginning to end: how constructors are called, how and in what order fields (including static fields) are initialized, etc...
21.03.2019
5516views
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Professor Hans Noodles Java Developer
20 March 2019 12:15
Widening and narrowing of reference types Hi! In a past lesson, we discussed casting primitive types. Let's briefly recall what was discussed. We imagined primitive types (in this case, numeric types) as nesting dolls that vary in size according to the amount of memory they occupy...
20.03.2019
9629views
20comments
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Andrew Random
19 March 2019 21:47
Next step, what do you suggest?While CodeGym is busy creating the next big content release, what would you suggest as a next step? My goal is to learn enough Java that I can start working as a Jr. Developer. I've been at this for almost a year now, going through online "Learn Java" programs, reading through several of the top recommended books...
19.03.2019
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Professor Hans Noodles Java Developer
18 March 2019 9:53
The difference between abstract classes and interfaces Hi! In this lesson, we'll talk about how abstract classes differ from interfaces and consider some examples with common abstract classes. We've devoted a separate lesson to the differences between an abstract class and an interface, because this topic is very important...
18.03.2019
18209views
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Vasyl Malik Java Developer
17 March 2019 8:29
Specific examples of abstract classes in Java Hi! In past lessons, we met interfaces and figured out what they're for. Today's topic will echo the previous one. Let's talk about abstract classes in Java. You probably remember what 'abstraction' is — we've already gone over it. :) If you forgot, fear not. Remember: it's a principle of OOP...
17.03.2019
24863views
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Professor Hans Noodles Java Developer
16 March 2019 7:58
Default methods in interfaces Every new version of Java differs from those that came before. Here's an example of changes in material that we've covered: before Java 5, the language didn't have enums. Similarly, Java 8 differs markedly from Java 7. Most of our lessons were written for the 7th version of the language...
16.03.2019
8379views
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Vasyl Malik Java Developer
8 March 2019 15:16
Relationships between classes. Inheritance, composition, and aggregation Hi! Today we'll take a closer look at one principle of Object Oriented Programming (OOP): Inheritance. We'll also study other types of relationships between classes: composition and aggregation ...
08.03.2019
21249views
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fahad khan Random
8 March 2019 8:23
just came back !!!!I have came back to the gym after 4 months or so. Feels good.thanks codegym!!! How much time should i spend every day to complete the course in 6 months?
08.03.2019
2047views
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