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[CS Technical Interview 6] Java and Object-Oriented Programming Made Clear

A course that helps you understand core Java and Object-Oriented Programming (OOP) concepts, and includes practice explaining them verbally in interviews

(4.9) 18 reviews

398 learners

Level Basic

Course period Unlimited

  • yiyj10305235
Java
Java
oop
oop
Tech Interview
Tech Interview
Java
Java
oop
oop
Tech Interview
Tech Interview

Reviews from Early Learners

Reviews from Early Learners

4.9

5.0

pray

100% enrolled

Wow... this is really so good...;;;; I need to save up money and buy everything in the roadmap.. I'm curious if you're planning to do any Spring lectures too.. I'll buy it right away..

5.0

karabiner

100% enrolled

The lecture pinpointed the key points, making it highly efficient for the time invested.

5.0

박상완 Sang Wan

55% enrolled

While preparing for Java developer interviews, I needed a systematically organized lecture, and this course was a great help. The detailed explanations of JVM structure, memory areas, exception handling, and other theories are memorable. This is a core summary lecture that can be directly applied in actual interviews.

What you will gain after the course

  • Understanding Core Object-Oriented Concepts in Java

  • The ability to explain things verbally in technical interviews

  • A practical workbook PDF that prepares you for follow-up questions

말이 트이는 CS 기술면접 소개 포스터

🥲 Have you ever had this experience in an interview?

1. Confusing concepts when answering

❓InterviewerWhat are the characteristics of object-oriented programming?
💬 Candidate The SOLID principles. First, S is..(omitted)...

This is a situation where the characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
object-oriented design principles (SOLID) are confused.
This can give the impression that the foundational framework of basic concepts is not established.

2. Knowing only What, but unable to explain How / Why

❓Interviewer What are the characteristics of TCP?
💬 Candidate It's a protocol that guarantees reliability.
❓ Interviewer What mechanisms guarantee reliability?
💬 Candidate Uh... well... it makes transmission safe... like...

You only know the superficial definition and are not prepared to explain the underlying principles.
If the 3-way handshake, sequence numbers, ACK, retransmission, flow control, and congestion control
are not connected as a single flow, you will inevitably get stuck on follow-up questions.

3. Getting stuck on basic questions

❓Interviewer What is HTTP?
💬 Candidate Um... it's for sending and receiving data on the web... something like that...?

It's a concept you're very familiar with, but when you actually try to explain it in one sentence, the words don't come out.
This isn't a lack of knowledge, but rather a lack of experience organizing and articulating it.


Just knowing is not enough. It only becomes true skill when you can articulate it.

🔥 So we've structured it this way.

✦ A cut above the rest, premium content for interview preparation

1⃣ CS Notes organized specifically for interview preparation

  • All essential concepts and principles you must review before interviews are compiled and provided as lecture materials.

  • While building your fundamentals, it's structured so you can review it again right before your interview.

  • Not just a simple summary, but with diagrams and easy explanations that even non-majors can fully understand.


Computer Architecture Lecture Material Example

2⃣ Appendix | Interview Practice Materials Provided

  • In interviews, the ability to explain clearly is far more important than simply knowing something.

  • However, organizing and practicing on your own is not easy and can be tedious.

  • At the end of the lecture materials, we've included "answering in one or two sentences" training to reduce the effort of organizing.


Database Course Appendix Example

3⃣ Prepare for follow-up questions with our Technical Interview Practice Workbook PDFincluded

  • "Will this course alone really be enough for speaking practice?"
    After pondering this question,

    I created a Technical Interview Practice Workbook.

  • I designed it so you can practice speaking as if in a real interview even on your own.

  • You can find detailed information about the workbook structure and how to use it in the workbook introduction video at the beginning of the course.

Operating System Workbook Example

4⃣ A course that keeps growing with a one-time purchase

  • This course is provided with unlimited access period.

  • The content will continue to expand with new explanations, additional examples, and more.

  • Even if the price increases as content is added, students who have already purchased
    can access all content at no additional cost.

  • It's a CS fundamentals book you can keep coming back to whenever you need it.

💡 Here's how to make the most of this abundant content

1⃣ Download the materials and learn key concepts while watching the lectures.
2⃣ Take notes on important parts to create your own CS interview notebook.
3⃣ Save it on your phone and review briefly whenever you have time.

If you have an interview coming up,
and don't have much time → Use the appendix [Interview Practice] in the course materials to quickly sharpen your interview skills.
If you have time → Complete your speaking practice like a real interview with the Technical Interview Practice Workbook..

🎯 Recommended for

Non-majors, job seekers, career changers, and others preparing for technical interviews who need to be able to articulate CS fundamentals verbally

CS majors who need to review

I've studied it before, but
I can't bring myself to reorganize all that CS knowledge again

Don't open those thick textbooks
again.
We'll cover only the essentials clearly.

Non-CS majors who find CS overwhelming

I'm preparing for technical interviews
for the first time and don't know
where to start

By following the roadmap, you can
focus on learning only
the core CS concepts..

Job seekers with no time to spare

I don't have time.
I just need to quickly review
only the CS topics that come up in interviews

You can quickly review on your own with
lecture materials and
interview chapters available.

🔥 Reviews from students who experienced it first

A truly helpful course.
Already proven by 3,000+ students.

⭐️⭐️⭐️⭐️⭐️

1. A lecture that shows how much the author has thought and considered from the student's perspective (seems to consider the learner's flow of understanding)
2. Easy to understand with diverse visual materials and examples
3. When learning knowledge, it mentions and reminds you of previously learned content, connecting the knowledge. Knowledge connects and the big picture emerges.
4. The depth of knowledge is not shallow. I'm taking OS right after Computer Architecture, and the synergy is great.
5. Scratches all the itches about "why" & "why it's used".
ps. Sorry to the author, but.. this is a lecture I want to keep to myself.

-'Operating Systems' Course Review

⭐️⭐️⭐️⭐️⭐️

Despite the short lecture duration, I really appreciate how you clearly explain only the important parts. Since it was somewhat theory-focused, I didn't expect SQL queries to be covered, but it was great that you showed examples one by one while teaching basic syntax and how to write queries. After that, the coverage of joins, normalization, transactions, indexes and data optimization, and security was excellent. I haven't tried other paid courses yet, but the last lecture appendix titled "Interview Practice" was great for self-study and practice as it directly showed questions and answers. The lecture duration isn't too long if you focus, so I think I'll go through it multiple times. Thank you

-'Database' Course Review

⭐️⭐️⭐️⭐️⭐️

The clear explanation of core concepts with a logical flow helped me quickly review data structures. Thank you for the great lecture.

-'Data Structures' Course Review

⭐️⭐️⭐️⭐️⭐️

Wow... this is really too good...;;;; I need to save up money and buy the entire roadmap.. I'm curious if you're planning to do lectures on Spring as well.. I'll buy it right away..

-Review of 'Java and Object-Oriented Programming'

⭐️⭐️⭐️⭐️⭐️

This is a lecture where you can organize the key concepts of JavaScript all at once by setting aside a day! Great for a reminder before interviews👍



Reviews for 'JavaScript'

⭐️⭐️⭐️⭐️⭐️

As a non-CS major, I was worried about how to study computer architecture and operating systems among CS knowledge, but the appropriate amount of content made it easy to learn without burden, and I loved how it felt like getting tutored by an expert. I'm planning to take the operating systems course as well and looking forward to it. Thank you!

-'Computer Architecture' Course Review

🖐 Hello! Let me introduce myself! 🙇

As a non-CS major, when I first prepared for a developer job, I only focused on algorithms and coding tests.
I gained some confidence and passed most coding tests, but I kept failing at the next hurdle—technical interviews. What was the problem? It was the lack of CS (Computer Science) knowledge.

I understand the thirst for fundamentals (CS knowledge, programming languages, etc.) better than anyone. I dove into countless materials through self-study and built my own know-how, and now I'm working as a 🧑🏻‍💻 Kakao developer.

Since I was young, I've been more confident than anyone in combining and reorganizing various materials to create 'my own consolidated notes'. This course is the secret notebook that contains all that know-how and passion.

🚀 The sixth course in the CS Series That Opens Your Mouth is Java & OOP.

  • Do you know the concepts of JVM and Garbage Collection (GC), but can you explain how they actually work?

  • Have you heard of multithreading and synchronization, but find it difficult to answer in one or two sentences during an interview?

📖 A curriculum packed with only the essentials chỉ chứa những nội dung cốt lõi

This is the curriculum and key topics you will learn in this course.

If there are any unfamiliar keywords, make sure to grasp them firmly this time.

  1. Object-Oriented Basics

    • Features of Object-Oriented Programming, SOLID Principles, etc.

  2. Java Overview

    • Java features, JVM / Garbage Collector (GC), reference types, Call by Value, static keyword, etc.

  3. Object-Oriented Programming

    • Java's OOP, polymorphism, interfaces and abstract classes, etc.

  4. Collections

    • Characteristics of List, Set, Map and various comparisons

    • Comparison of various Sets (HashSet, LinkedHashSet, TreeSet)

    • Comparison of various Maps (HashMap, LinkedHashMap, TreeMap, ConcurrentHashMap)

  5. Multithreading and Concurrency

    • Multi-threading implementation methods

    • • synchronized keyword and volatile keyword, etc.

  6. Exception Handling and Other Concepts

    • Exception handling methods, exception hierarchy, serialization/deserialization, String vs StringBuilder/StringBuffer comparison, etc.

  7. Modern Java (Java 8 and later)

    • Functional interfaces and lambda expressions, comparison of collections and streams

  8. [Appendix] Interview Practice

    • Review key concepts once more in Q&A format

✏ What You'll Learn

1⃣ Object-Oriented Design Principles and Application Methods

  • Learn from SRP (Single Responsibility Principle), the core philosophy of object-oriented programming, to the 5 SOLID principles.

  • By comparing poorly designed code with refactored code, you'll understand how to improve maintainability and scalability.

  • Through practical Java code examples, you can firmly grasp the 'application methods' rather than just theory.

SRP 설명 및 코드 예시

SRP explanation and code examples

2⃣ Easily explain confusing core Java concepts with diagram-focused illustrations

  • JVM and Memory Structure The JVM execution process and the roles of Stack/Heap memory areas are easily explained through diagrams.

  • GC (Garbage Collector) Operating Principles Learn the complex GC process not through abstract explanations but by following visual diagrams, allowing you to firmly grasp the concepts.

  • You will learn in depth how the call by value method is reflected in actual memory state and code execution, along with diagrams. được phản ánh trong trạng thái bộ nhớ thực tế và việc thực thi mã thông qua sơ đồ minh họa.

GC 동작 과정

GC operation process example

JVM의 구성 요소 설명

Example of JVM component explanation

call by value 원리 설명

Explanation of call by value principles

3⃣Multithreading and Synchronization Strategies for Immediate Practical Use

  • Various thread creation methods implemented with Thread, Runnable, and ExecutorService

  • The meaning and operational differences of the synchronized, volatile keywords

  • Compare code execution results before and after synchronization to learn safe shared resource access methods

synchronized 키워드 설명 예시

Example of synchronized keyword explanation

👀 Course Preview

If the video is frozen, please refresh :)

Garbage Collector (GC) explanation

All in One! Complete Guide to Confusing Essential Java Concepts

말이트이는 CS 시리즈

Things to Note Before Enrolling

  • Provided learning material format: PDF

  • Prior knowledge of basic Java syntax is required.

Recommended for
these people

Who is this course right for?

  • A non-CS major who feels lost because they're new to studying computer science

  • A computer science major who needs to organize CS concepts before a technical interview

  • A job seeker preparing for a career change who has limited time before a technical interview

Need to know before starting?

  • JAVA Basic Syntax

  • Learning becomes much easier if you have basic operating system concepts like memory and threads.

Hello
This is

3,787

Learners

170

Reviews

24

Answers

4.9

Rating

7

Courses

Education and Experience

  • Graduate of Seoul National University

  • Current Kakao Server Developer

    Course Introduction I am creating the "Fluent CS" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I understand the importance of CS...

Course Introduction I am creating the "CS for Speaking" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I...

Course Introduction

I am creating the
CS Speaking series to help you articulate CS concepts during interviews.

Teaching Philosophy

I started my development career as a non-CS major and went through a lot of trial and error while personally organizing everything from CS fundamentals to technical interviews. Based on the learning methods and conceptual organization know-how accumulated through that process, I create content that makes core concepts encountered in practice and interviews easy to understand through illustrations.
"I am creating the lectures that I needed back then."

Blog yiyj1030.tistory.com → Running a tech blog that simplifies CS, algorithms, and practical concepts. Contact yiyj1030@gmail.com

Blog

  • yiyj1030.tistory.com
    → Running a tech blog that simplifies and organizes CS, algorithms, and practical concepts

Contact

yiyj1030@gmail.com

Curriculum

All

33 lectures ∙ (3hr 6min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

18 reviews

4.9

18 reviews

  • tommy0419님의 프로필 이미지
    tommy0419

    Reviews 24

    ∙

    Average Rating 5.0

    5

    100% enrolled

    I took this course to quickly review concepts. Overall, you covered everything well, which helped me review quickly. Thank you.

    • asd21123님의 프로필 이미지
      asd21123

      Reviews 11

      ∙

      Average Rating 4.5

      5

      100% enrolled

      Wow... this is really so good...;;;; I need to save up money and buy everything in the roadmap.. I'm curious if you're planning to do any Spring lectures too.. I'll buy it right away..

      • happhuy2089님의 프로필 이미지
        happhuy2089

        Reviews 1

        ∙

        Average Rating 5.0

        5

        100% enrolled

        It felt like it meticulously filled in the missing parts. I think other series would also be helpful to watch before interviews.

        • yiyj10305235
          Instructor

          Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)

      • doitdoit님의 프로필 이미지
        doitdoit

        Reviews 28

        ∙

        Average Rating 5.0

        5

        100% enrolled

        This is a lecture you can watch to grasp the major topics before an interview.

        • yiyj10305235
          Instructor

          Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)

      • javarunner님의 프로필 이미지
        javarunner

        Reviews 76

        ∙

        Average Rating 4.9

        5

        31% enrolled

        • yiyj10305235
          Instructor

          Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)

      $29.70

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