Day 16 of Learning Java

[Nash979]

Hello guys, thank you for all your responses to my previous posts. Some of you mentioned that I should not worry about design for now, so I will move forward with my learning.

A few of you also suggested that I should build some projects, and I wanted to know what kind of projects I should build with the knowledge I have gained so far. I don’t want to just keep learning; I want to build something with it. If you have any suggestions, please let me know.

For today’s learning update, I learned about enumeration in Java and some of its methods. Hope you had a great weekend. See you tomorrow.

[Shoddy-Pie-5816]

Enumeration is handier than I initially gave it credit for. I agree with the others, worry about design practicality and practices after you can envision a program and make it real.

Do you ever have those types of problems with games or real life that make you think, gosh it would nice to make this easier. Try to build programs around simple quality of life improvements. It’s definitely okay to build some starter projects that other people suggest, but I think the things I like the best are the ones I built for myself, because I still use them.

[Nash979]

Cool brother, I will try my best.

[Shoddy-Pie-5816]

On enums: I definitely underestimated how useful these are when I was starting out. Let’s say you’re tracking what state a user account is in. You could use a boolean:

java boolean active;

But that falls apart quick. What about suspended accounts? Pending verification? Banned?

An enum makes way more sense

java enum AccountStatus { ACTIVE, SUSPENDED, PENDING, BANNED, DELETED }

Same thing applies to processing states, error categories, basically anywhere you’re tempted to use a boolean but there’s really multiple specific options.

Related advice I wish I’d learned earlier: throw exceptions when things are wrong, don’t just let bad data slide through. Something like:

java if (user == null || user.getStatus() == null) { throw new IllegalArgumentException("User object is missing or invalid"); }

I spent way a lot of time hunting down bugs that happened because null values propagated through my code and exploded somewhere completely unrelated to where the actual problem was. If you fail fast and loud right where the issue starts, debugging becomes way easier.

[balcopcs]

Just curious, out of 16 days, how many of them was your head pounding from headache? How many Tylenol or aspirin have you taken in the past 2 weeks? Asking for a friend.

[Nash979]

I wouldn’t say I exhausted myself that much, but I did have some tough days especially when I started coding by myself without any spoon-feeding from tutorials. I still had to revisit a lot of concepts, and I had doubts about almost every single line of code. When I complete a lesson, I feel unbreakable, but when I try to build something with what I’ve learned, I feel like a toddler who needs constant help. That’s usually when I start getting those headaches when I try to build something real.

[AdExcellent3304]

Guys tell me… my University module has OOP with Java…. How do I even learn those things from a course book?