BEST

Programming Language

Java Done Right - by Yalco

Name: Java Done Right - by Yalco
Price: 30800 KRW
Rating: 4.8 (94 reviews)

An era where just learning the basics isn't enough to survive. Dig deep and master Java once and for all!

(4.8) 94 reviews

2,448 learners

Level Beginner

Course period Unlimited

yalco

Java

Functional Programming

oop

Java

Functional Programming

oop

Reviews from Early Learners

4.8

5.0

김종성

52% enrolled

I studied Java once with a book, but I didn't know much about it, so I looked for a different way to study and listened to the lecture. At first, I was not sure if it was long because it was not much different from the book, but the more I listened, the more I became convinced that I had done well in listening to the lecture. The lecturer explained it with analogies, so I understood it better than when I studied with the book, and I think he explained it in more detail than in the book. So now I feel like I know and understand Java a little bit. And the system where I can ask questions right away is also really good. I don't usually leave reviews, but if there are people like me who are wondering whether to just study with the book again or listen to the lecture, I wrote this because I wanted to let them know that they won't regret listening to the lecture.

5.0

CHOPAV

90% enrolled

Where else can I take a course like this at this price, ... I'm still a little lacking in writing code on my own... but I'm confident that I can do it if I study hard!! I'll study hard until I finish the course! Thank you ~!!!!!!!

5.0

woo jung Roh

22% enrolled

I haven't taken all of the classes yet because I'm looking for the parts I need, but I'm leaving a review first because the lectures are really good. The lecture materials are organized and prepared in a way that's easy to find. When I'm in a hurry, I can just look at the code in Notion, and it's also good for debugging by copying and pasting. (Of course, when I have time, it's best to try it out myself.) And the examples are fun and well-made. They contain the content that's essential for understanding the concepts, but they're also interesting and provide good stimulation. This is Yalko's second lecture after JavaScript Reactive Programming. I felt that all of the lecture materials and lecture content were full of useful content without any unnecessary details. Thank you for preparing such a great lecture.

What you will gain after the course

From Java basics to detailed syntax and advanced usage
In-depth theory and practical knowledge of Java
Latest features and syntax based on Java 17
Object-Oriented Programming in Java
Functional Programming through Collections and Streams
Advanced Techniques for Multitasking
Implementing advanced features through reflection
How to use build tools and libraries

Java, from the basics to application
finish it all at once with a single course!

With Yalco, a YouTuber with 90,000 subscribers
Intensive Java Language Course 🔥

I wanted to create a course that eliminates the need to take any other courses once you've finished it. As a beginner, have you ever felt that something was missing when jumping into practical work after taking a basic course?

To save you the trouble of searching for advanced lectures and content to quench your thirst for knowledge, I have finally completed a course after long preparation that 🍼 dives deep into everything from the very basics for beginners to advanced concepts and applications for professionals in one go. Especially in this day and age where AI is replacing coders, this course will be of great help in growing into an essential talent.

Who is Yalco? 😀

I am a YouTuber who runs the "Shallow Coding Dictionary" channel and an author of IT books. I create content that explains difficult programming concepts through metaphors, simple examples, and sometimes animations to make them easy for beginners to understand. By day, I work as a full-stack developer.

Recommended for these people 🙋‍♀️

People starting programming with Java

We teach step-by-step starting from the very basics so that even beginners can learn easily.
⚠️ However, the pace of the lecture may feel fast, or the amount of content to learn may seem overwhelming. Please make sure to check the free sections first!

Those who want to dig deep into Java and
study it properly

We will clearly define concepts that were once vague and hazy.
Stop coding by trial and error! Become a skilled professional who won't be replaced by AI.

Job seekers who want to get a job as a developer (especially backend) in Korea

Technical questions in coding tests and interviews will no longer be intimidating.
You will acquire the Java theoretical and practical knowledge that companies desire.

Developers who use Java-based technologies like Spring, but
feel their understanding of Java is lacking

Stop copy-pasting code! Now you can understand what this code does and why it's used this way.
You will be able to utilize the technology you handle more effectively.

Special points unique to
Yalco's Java course ✨

Youtuber Yalco's
top-tier explanatory power 💡

Yalco has been a source of strength for students and job seekers through videos that explain coding knowledge easily! Through witty metaphors and simple examples, he provides a clear understanding of various concepts that once felt complex.

Too-Much-Explainer's
Detailed Lecture 🎙️

We delve deep into not only Java syntax and basic usage but also how each feature operates, how the relevant classes and libraries are designed, and how they each impact internal performance.

Efficient and in-depth learning through debugging 🐞

Instead of simply printing values to the console, we will learn efficiently and deeply by making full use of IntelliJ IDEA's debugging features to intuitively check values used in examples and examine the internal details of instances.

Convenient practice through
Notion pages 🖥️

We provide a lecture page so you can check text content and example codes through your browser and copy-paste them. (🔗 Free Part Link)

All the knowledge you will learn in this lecture is condensed into examples prepared with great care over a long period. You can follow the lecture while viewing, copying, and pasting these examples directly from the webpage for hands-on practice.

Basic content released for free 😎

To ensure students can study without any burden, half of the entire curriculum is available for free through the preview.

어떤 내용을 배우게 되나요? 📚

🏁 Section 0. Intro

Introduction to the Java language, reasons why you should learn Java
Concepts regarding JVM, JRE, JDK, and Java versions

👟 Section 1. Preparation for the Course

How to use the console, comments, and semicolons
Concepts and internal principles of variables and constants / Memory concepts

🌱 Section 2. Getting Started with Java

How to run Java and its principles
How to use comments

🧮 Section 3. Java Data Types and Operators

The concept of data types, how to use the IntelliJ IDEA debugger
Primitive data types and the operators used with them
The concept of floating-point error
Principles and basic functions of strings / The concept of null
Concepts and principles of primitive types and reference types
Type Inference

🚥 Section 4. Control Statements and Methods

Conditional statements (if, else, switch) and practical usage methods
for loops (standard, object, array) / iteration via (do) while
Concepts and various forms of methods

📦 Section 5. Object-Oriented Programming

Concepts and various applications of classes
Static Elements / Accessor Concepts
Inheritance and Polymorphism
Abstract Class / Interface
Singleton Pattern

🎁 Section 6. Learning More About Classes

Block / Scope / Package Concepts
Inner classes / Anonymous classes / Main method
Enums / Records
Useful Library Classes

🎲 Section 7. Classes and Data Types

Object Class
Wrapper Class
Generics

🍡 Section 8. Collection Framework

Concept of Collections
Variations and usage of List / Set / Map
Concepts and usage of Comparable / Comparator
Iterator

🦾 Section 9. Functional Programming

Functional Interface
Lambda Expressions / Method References
Concepts and usage of Streams

🐞 Section 10. Preparing for Errors

Concepts of Errors / Exceptions, Types of Exceptions
try / catch / finally statements
Defining / Throwing / Rethrowing Exceptions
try with resources
NPE and Optional

🏭 Section 11. Multitasking

Threads / Thread Groups / Daemon Threads
Synchronization and various thread-safe methods
Thread Pool
Future / CompletableFuture
Parallel Streams

🏭 Section 12. Data I/O and Networking

Handling files / folders through NIO
I/O Streams / Reader & Writer
Serialization
URL Connection / Socket Programming

🛠️ Section 13. Reflection and Annotations

Reflection / Class Loader
Concepts and usage of annotations
JavaDoc

📚 Section 14. Libraries

Sourcepath / Classpath
JAR
Build Tools (Gradle)
Utilizing External Libraries / Useful Libraries

Check out the
frequently asked questions 💬

Q. What can I do after learning Java?

Java has been one of the most beloved languages worldwide for a long time. Especially in Korea, technologies utilizing Java, such as Spring, are widely used, making it an advantageous language for domestic employment. Furthermore, since Java shares the classic characteristics and designs found in other languages, mastering Java alone will allow you to learn other languages very easily.

Q. What are the features that distinguish this course from other Java courses?

This course proceeds with numerous examples packed with various knowledge about Java. You can practice conveniently by using the 🔗 lecture page, where you can examine and copy-paste all the examples.

Instead of just looking at each Java syntax element and feature on the surface, we dive deep into how each is internally structured and operates through debugging and examining original source code. We explore how they relate to other features or concepts and what constitutes efficient usage. Since the lecture density is very high, you will acquire a vast amount of knowledge relative to the total duration (20 hours).

Q. I am already working with Java in practice; how much will this lecture help me?

Deeply understanding the language that serves as the foundation of the framework you use is essential for properly utilizing that technology. You must learn Java thoroughly to prevent various inefficiencies, errors, and performance degradation that occur in practice, and to use your technology stack freely. Continuous in-depth learning is also essential to grow into a professional who cannot be replaced by AI.

Please check before taking the course
Learner Notes 📢

Practice Environment

Operating System and Version (OS): You can learn on Windows, Mac, and Linux.
Tools Used: The practice sessions will be conducted using the free version of IntelliJ IDEA. (The free version is sufficient)

Learning Materials

🔗 Free Section Lecture Page (Paid section page provided upon enrollment)

Prerequisite Knowledge and Precautions

기초부터 설명하므로 선수지식이 없는 입문자도 수강하실 수 있습니다.
- However, the lecture may be fast and contains a lot of content for some students, so please check the free part in advance!
자바에 대해 어느정도 지식이 있다면 더 많은 개념들을 수월히 익히실 수 있습니다.
- It is highly recommended that you take the course while looking at the examples on the lecture page above.
- If you only watch the video, it may be difficult to follow the middle and latter parts visually.
Please make sure to post your questions on the Notion page as instructed at the beginning of the lecture.

Recommended for
these people

Who is this course right for?

Someone who has just entered the field of development and started learning how to code
Those who need Java knowledge to properly use Spring (Boot), etc.
Developers who want to delve into Java more properly and deeply

Hello
This is yalco

34,139

Learners

1,951

Reviews

Answers

4.9

Rating

Courses

I am the YouTuber behind the channel Yal-co's Coding Dictionary, as well as an author of IT books. Drawing on my experience as a full-stack developer, I create content that explains difficult programming concepts through metaphors, simple examples, and sometimes animations to make them easy for beginners to understand.

🎬 YouTube Yal-co's Coding Dictionary Channel (Click!)
📕 View Yal-co's Books (Click!)

Curriculum

All

103 lectures ∙ (22hr 19min)

Course Materials:

Lecture resources

Section 1. Intro

3 lectures ∙ (12min)

Section 2. Preparation for the course

7 lectures ∙ (43min)

Section 3. Getting Started with Java

3 lectures ∙ (52min)

Section 4. Java Data Types and Operators

13 lectures ∙ (3hr 0min)

Section 5. Control Statements and Methods

7 lectures ∙ (1hr 48min)

Section 6. Object-Oriented Programming

10 lectures ∙ (2hr 6min)

Section 7. Learn more about classes

9 lectures ∙ (1hr 36min)

Section 8. Classes and Data Types

5 lectures ∙ (1hr 6min)

Section 9. Collection Framework

6 lectures ∙ (1hr 23min)

Section 10. Functional Programming

6 lectures ∙ (1hr 32min)

Section 11. Preparing for errors

6 lectures ∙ (1hr 8min)

Section 12. Multitasking

9 lectures ∙ (1hr 58min)

Section 13. Data Input/Output and Networking

7 lectures ∙ (1hr 39min)

Section 14. Reflection and Annotation

5 lectures ∙ (1hr 11min)

Section 15. Library

4 lectures ∙ (55min)

Section 16. Closing the lecture

3 lectures ∙ (1hr 1min)

Published: 07/19/2023

Last updated: 02/22/2026

Reviews

All

94 reviews

4.8

94 reviews

2002dreams2852
Reviews 2
∙
Average Rating 5.0
10/22/2023
5
52% enrolled
I studied Java once with a book, but I didn't know much about it, so I looked for a different way to study and listened to the lecture. At first, I was not sure if it was long because it was not much different from the book, but the more I listened, the more I became convinced that I had done well in listening to the lecture. The lecturer explained it with analogies, so I understood it better than when I studied with the book, and I think he explained it in more detail than in the book. So now I feel like I know and understand Java a little bit. And the system where I can ask questions right away is also really good. I don't usually leave reviews, but if there are people like me who are wondering whether to just study with the book again or listen to the lecture, I wrote this because I wanted to let them know that they won't regret listening to the lecture.
- yalco
  Instructor
  10/22/2023
  Thank you for taking the class! I was worried about the way I asked questions, but I am also grateful that you gave me this feedback so that I can be confident. If there is anything that is a little confusing or difficult to understand, please feel free to ask questions! I will do my best to help you learn more and more easily than in the book!
wj
Reviews 3
∙
Average Rating 5.0
09/04/2024
5
22% enrolled
I haven't taken all of the classes yet because I'm looking for the parts I need, but I'm leaving a review first because the lectures are really good. The lecture materials are organized and prepared in a way that's easy to find. When I'm in a hurry, I can just look at the code in Notion, and it's also good for debugging by copying and pasting. (Of course, when I have time, it's best to try it out myself.) And the examples are fun and well-made. They contain the content that's essential for understanding the concepts, but they're also interesting and provide good stimulation. This is Yalko's second lecture after JavaScript Reactive Programming. I felt that all of the lecture materials and lecture content were full of useful content without any unnecessary details. Thank you for preparing such a great lecture.
dismas
Reviews 7
∙
Average Rating 5.0
06/30/2024
5
100% enrolled
Whenever I develop, if there is something I don't know, I keep coming back and checking. The lectures are good, but the parts organized through Notion are a great help in development. It's like a comprehensive gift set. If you feel something is lacking while studying Java, you can fill it in through this lecture.
- yalco
  Instructor
  06/30/2024
  I'm so glad that the things I've worked so hard on and prepared for have been helpful! Thank you!!
seokyung0221
Reviews 5
∙
Average Rating 5.0
04/18/2024
5
100% enrolled
To conclude, 'There is no lecture like this at this price anywhere in the world...!'. In fact, you can feel the taste of object-oriented programming JAVA just with the free part, but the paid part is really packed with easy-to-see examples and explanations! Of course, you have to review, but I think that thanks to this thoroughness, you can easily get the idea of 'Oh, this concept was like this' in one lecture. Some people said that the lecture was too fast, so I was worried, but I looked at the code on the Notion page provided first or typed it myself and then listened to the lecture, so there was no problem with that part. In fact, I listened to some parts at 1.5x speed, so I think those who are taking the lecture don't have to worry. Of course, the lecture content is not easy... There is a lot to memorize! Especially the paid part! However, I think it's because Java itself is a subject that you have to learn a lot, so you can approach it more easily through easy examples, and because the lectures are divided into 'things that are good to know now', 'things that are good to look up later when you need them, things to just look at', etc., I think it was a class that could greatly lower the entry barrier to Java through the lectures! Of course, I haven't memorized all the parts I need yet... But I think I can learn it quickly through review. I dream of becoming a backend developer, so this was a lecture that I really needed. Thank you!
- yalco
  Instructor
  04/18/2024
  Thank you for giving me a great sense of accomplishment as I prepared so hard ㅠㅠ There were many parts that I was worried about, but I'm so glad that the lecture was helpful!! If you have any further questions or difficulties in practice, please feel free to ask and I will be happy to help you at any time. Thank you!!!
chopav
Reviews 1
∙
Average Rating 5.0
08/07/2023
5
90% enrolled
Where else can I take a course like this at this price, ... I'm still a little lacking in writing code on my own... but I'm confident that I can do it if I study hard!! I'll study hard until I finish the course! Thank you ~!!!!!!!
- yalco
  Instructor
  08/07/2023
  Thank you so much... I've been preparing and producing for over half a year, but I've been worried and sometimes even dizzy if this method is right and if the explanations will be understood by the students. I'm so happy and it's rewarding that the lectures were helpful to non-majors!! Please feel free to ask questions about any difficult or insufficient explanations during the remaining course! I'll do my best to help you until the end. Thank you for taking the course!!!

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This is a course where you can learn UML and object-oriented design even without programming experience. Concepts are explained through everyday examples (cafes, libraries, shopping malls), and you'll learn 9 types of UML diagrams step by step. You'll develop design skills that can be immediately applied in practice using theory and PlantUML.

Beginner

oop, Architecture, uml

Introduction to UML and Object-Oriented Design: Essential Fundamentals for Developers Made Easy Even for Non-Majors

kmmom591

【2025 Edition】Unity×C# Beginner Course｜Master 2D Tower Defense Game Development｜How to Create Click & Battle Systems

Sorappu

Click to summon characters and battle each other in this full-scale 2D tower defense game development course. You can learn to create an extremely authentic game using R3 and highly scalable implementations with reactive programming and more!

Basic

C#, Unity, Content Creation

【2025 Edition】Unity×C# Beginner Course｜Master 2D Tower Defense Game Development｜How to Create Click & Battle Systems

Sorappu

React and Vue Learning Essentials - Mastering Core Modern JavaScript Syntax

usefulit

This course is a video lecture that systematically covers the core modern JavaScript syntax essential for learning React.js and Vue.js frontend development. It is structured to help you develop efficient coding skills through ES6+ syntax, latest features, and practical examples that can be directly applied to work and learning.

Beginner

Java, Vue.js, react.js

React and Vue Learning Essentials - Mastering Core Modern JavaScript Syntax

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iOS App Monetization Start, Swift Grammar Master [Beginner]

jangsanggu

When learning Swift, the iOS programming language, it can be confusing when multiple concepts appear all at once. That's why I created this course with the principle that "when understanding a new concept, only previously learned concepts should be used." So this course is meticulously designed with a sequential structure between concepts, where only one new concept appears at each stage, and no other unfamiliar concepts appear at all. One concept per minute, 180 concepts total. From the basics of variables and constants to understanding memory structure from a CS perspective, and even the latest syntax for asynchronous processing. In 3 hours, you'll learn 180 core concepts in the designed order.

Beginner

iOS, Swift, oop

iOS App Monetization Start, Swift Grammar Master [Beginner]

jangsanggu

Java Done Right - by Yalco

Reviews from Early Learners

4.8

What you will gain after the course

https://youtu.be/iN22AgS_Chk

With Yalco, a YouTuber with 90,000 subscribersIntensive Java Language Course 🔥

Who is Yalco? 😀

Recommended for these people 🙋‍♀️

Special points unique to Yalco's Java course ✨

Youtuber Yalco's top-tier explanatory power 💡

Too-Much-Explainer's Detailed Lecture 🎙️

Efficient and in-depth learning through debugging 🐞

Convenient practice through Notion pages 🖥️

Basic content released for free 😎

🏁 Section 0. Intro

👟 Section 1. Preparation for the Course

🌱 Section 2. Getting Started with Java

🧮 Section 3. Java Data Types and Operators

🚥 Section 4. Control Statements and Methods

📦 Section 5. Object-Oriented Programming

🎁 Section 6. Learning More About Classes

🎲 Section 7. Classes and Data Types

🍡 Section 8. Collection Framework

🦾 Section 9. Functional Programming

🐞 Section 10. Preparing for Errors

🏭 Section 11. Multitasking

🏭 Section 12. Data I/O and Networking

🛠️ Section 13. Reflection and Annotations

📚 Section 14. Libraries

Check out thefrequently asked questions 💬

Please check before taking the courseLearner Notes 📢

Practice Environment

Learning Materials

Prerequisite Knowledge and Precautions

Recommended for these people

HelloThis is yalco

Curriculum

Reviews

yalco's other courses

Similar courses

With Yalco, a YouTuber with 90,000 subscribers
Intensive Java Language Course 🔥

Special points unique to
Yalco's Java course ✨

Youtuber Yalco's
top-tier explanatory power 💡

Too-Much-Explainer's
Detailed Lecture 🎙️

Convenient practice through
Notion pages 🖥️

Check out the
frequently asked questions 💬

Please check before taking the course
Learner Notes 📢

Recommended for
these people

Hello
This is yalco