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sounds like an answer from ChatGpt

Why you keep replying on old post?

Why don't you try to run using IDE?

stop spamming

STOP SPAMMING

Maybe there's some code issue on client server?

Do you have Java basic?

I would suggest you to read this book --> Introduction to Java programming

What doesn't work here?

It will return the value of the class-level static variable num, which was set to 3 initially.

Have you fixed?

maybe use Java Swing ?

What error you got and what you want to achieve?

I've been writing one/two projects but I not using them. I'm not sure in which
scenario I should use them. Is this consider bad programming style?

Because you are not using it. You may remove it.

Hey, take a look on this
https://www.c-sharpcorner.com/blogs/steps-to-run-java-program-using-command-prompt1

Post your code too

At where you define parsedouble function?

Use Scanner.

You can see this tutorial https://www.w3schools.com/java/java_user_input.asp

Maybe tell us how you create the jar?

ENGLISH PLEASE

where is your update query?

No problem and all the best :-bd

You have to call song() again inside beersOnWall method.

You can use DecimalFormat .


DecimalFormat value = new DecimalFormat("#.#");
System.out.println(value.format(som(20.20, 10.10)));

Don't forget to add this line


import...