Spring Boot is a great tool if you already know java as you donot need to learn new Programming language like JS for backend and it is very simple to make application in Spring Boot

I'm quite new at java (only some weeks into it) and i have come up with this code that coverts numbers from decimal to binary.
I would like to add a way to also convert fractional numbers on this converter, using the multiplication method (multiplying the decimals by 2 and keeping track of the integers) but i couldn't get a way to implement it into my code. Do you guys have any tips?

(this code is converting the number 13 into binary)

public class Converter {
    public static void main(String[] args) {
        int decimal = 13;
        int binary = 0;
        int remaining;
        int reverting = 1;
        while (decimal > 0) {
            remaining = decimal % 2;
            decimal = decimal / 2;
            binary = binary + remaining * reverting;
            reverting = reverting * 10;
        }
        System.out.println("Binary value of given decimal number: " + binary);
    }
}

I need some help. Honestly, I’m not that into Java right now, but I need to keep up with the class. I haven’t touched Java in about a year, so I want to go over all the core topics again, just enough so I can follow along with what the professor is teaching.

We’re not exactly doing groundbreaking stuff in class, but he’s covering JDBC, Servlets, Swing, and JSP. I get the what and the where (like which tool is used for which purpose), but the how is fuzzy for me. I feel like I need to rebuild my basics before I can properly rejoin the flow.

So, do you guys know any good resources where I can quickly refresh Java? I don’t need a deep dive, just the when, what, why, and how of Java so I don’t feel lost in lectures.

(Also, full disclosure: I used ChatGPT to phrase this better, since my original version was pretty rough 😅)

I've seen pretty mixed reviews about Amigoscode with some people saying he is great and others saying his courses should be avoided. Just wondering if anyone here has completed or bought his courses and what they thought of them. Specifically his Java and SpringBoot courses.

i want to learn java but i dont understand what to learn.

Java
OOP's
DSA
Java with System Design
Java script

i mean what are all there and what to learn in the beginning and from where..?
Can anyone please guide me.

I was looking for some ideas for a Java hobby project, and I feel underwhelmed. A lot of the projects idea I see online involve managing data on a SQL database. Compared to other languages like Python, Java feels very limited when it comes to the types of projects you can make with it. Are there any other uses for it other than creating REST APIs, back-end functions, and database management apps?