Hyangro Win Challenge: Complete the Course with Hyangro

Hello, this is Hyangro 🙂
Are you all still keeping the fire burning in your hearth even after the Chuseok holiday?

Days have been passing by so frantically that Halloween has already approached 😊😊
Although Halloween is just a one-day event, I thought it would be fun to study together during this period as well.
So this time, I found myself pondering what mindset would be good to have when participating in the challenge.

As many of you know, I first learned web development at a government-funded academy and got a job through that.

When I first learned Java and web development through the government-funded academy, I thought a lot about how I could absorb this knowledge quickly.
Simply listening to the teacher's explanations didn't help me understand at all, so I considered various approaches.

Among them, the method that worked best for me was "teaching my academy classmates."
I would organize what I learned during class hours (from 9 AM to 4 PM) every day and summarize it within 1-2 hours to teach my academy classmates.

I was learning about AOP in the Spring Framework when I heard an explanation about reflection, but I didn't understand it well.
What exactly is this needed for? How is it utilized? Are there things to be careful about when using it? And so on.
Anyway, since it was mentioned in class, I had to teach this to my classmates, so I read the explanations in the books I had several more times.
I understand it conceptually, but I was curious about what precautions should be taken when using it.

So while thinking "What are the things I need to be careful about when using this in actual work?", I was searching for related books and discovered Java Performance Tuning: Coding Habits and Stories That Determine Performance written by Lee Sang-min.

There was a table of contents about when to use reflection in practice and what points to be careful about.

This was it! As soon as I finished class, I rushed to Kyobo Bookstore in Gangnam and bought it right away to organize the content.
I gathered and organized all the content about reflection from various books including Java: The Complete Reference, Passionate Java Lectures, Toby's Spring, and Lee Sang-min's "Java Performance Tuning: Coding Habits and Stories That Determine Performance."

Based on the organized content, I summarized and shared that day's class materials with my classmates, and the content was apparently so good that after the study session ended, many people were curious about where I had learned it from.

Excitedly, I had just introduced Lee Sang-min's book that I had bought fresh and hot.
Contrary to my expectations, my classmates looked at me very strangely for spending 20,000 won just to read a dozen or so pages out of hundreds of pages.
(Back then, jajangmyeon was around 4,000 won)

The Reflection chapter is one of 24 chapters, so by simple calculation, it's an irrational choice to pay 100% to check only 4% (1/24) of the content.
Still, I didn't feel it was a waste at all.
Because I gained the one line of knowledge I needed.

Even after that, I often experienced "I bought this book, this lecture just to get this one sentence."

For example, I got this sentence from "How Should We Then Live?" which I've mentioned several times before.

"Most people who call themselves pitiful are actually great."
Recognizing oneself as pitiful is because one wants to become great.
A person who pities themselves also regards themselves as great.
It's like a king who has been stripped of his throne pitying himself.
If he weren't a king who lost his throne, who else would be sad about not sitting on the throne?
The reason we feel regret for our mistakes is because we know we could have acted correctly at that time.
If we didn't have the power to hear the voice of right reason and act according to what that voice tells us, we would never regret our mistakes or suffer because of them.

What has also stayed with me for a long time is Vlad Mihalcea's High-Performance Java Persistence book, specifically the 34. Batching the Update Operation with JPA and Hibernate chapter, where he provides a detailed comparative explanation of JPA's Merge and Hibernate's Update in batch environments.

"Ah, I bought this book to get this one sentence."
"I took this lecture for this one line."

The thrill of that moment when the fog in your mind clears and something just 'clicks' into place. That alone was worth the value of an entire book or a single lecture.

This challenge is about spending all day on Halloween listening to Inflearn lectures and each person gaining and sharing 'one single learning that helped me grow'.

The value of knowledge doesn't seem to be proportional to its quantity🙂
Sometimes a 10-hour lecture or a 500-page book exists for that 'single line' that makes you go 'Aha!'
How about spending this Halloween to find that one sentence, that one chapter?

Just as I learned the essence of reflection from Sangmin's book, I sincerely hope that through this challenge, you too will discover the key to problems you've been pondering for a long time, or find that 'decisive line' that brings new inspiration.

Let's all find our own 'one line' together 🙂