How to determine a java program output without any IDE?

Question

I want to know that is there a way to determine a output of any java program without any dedicated IDE? For an example, a program snippet may be like...

int i=3,n=0;
while (i<4)
{
   n++;
   i--;
}
System.out.println(n);

There is no "correct output" in your question. I downvoted because [No research](http://idownvotedbecau.se/noresearch/) — Timothy Truckle, Jun 20 '21 at 14:41
I also know i can write a java program without an IDE... i have a basic knowledge — Captain Tiger, Jun 20 '21 at 14:42
It depends on your OS (shells, environment variables). Your question seems basic so forgive posters if they ask for missing basic info. Like what attempts have you made? — Alan, Jun 20 '21 at 14:44
Related: [How to launch single-file programs in Java 11 (or later)?](https://stackoverflow.com/questions/51935636/how-to-launch-single-file-programs-in-java-11-or-later) — andrewJames, Jun 20 '21 at 15:06
With a small fragment of code like the one in the question, can you step through it line-by-line in your head, and understand what each line is doing? If not, then you can research the specific statement/syntax which is causing a problem. If you want to confirm your understanding by executing the code in as simple a way as possible, then you now have several suggestions, here. (There are also online tools which can execute your Java code.) But learning to use an IDE will be a good investment (assuming you don't already use one). — andrewJames, Jun 20 '21 at 15:21
Does this answer your question? [How to execute a java .class from the command line](https://stackoverflow.com/questions/1279542/how-to-execute-a-java-class-from-the-command-line) — Amal K, Jun 20 '21 at 16:29

score 0 · Answer 1 · answered Jun 20 '21 at 15:01

0

If you got JDK9+ you can run your java code on prompt with no ide. try run jshell on prompt/cmd/powershell and test your code. if you need run a lot of line on jshell try /edit

answered Jun 20 '21 at 15:01

Dilermando Lima

1,004
8
21

score 0 · Accepted Answer · answered Jun 20 '21 at 15:03

If you use Java version 9 or higher, you can use the Java REPL (JShell) to try pieces of code. Install it on your computer, or use an online service (e.g. replit.com).

Or, use a text editor, and create a .java file, compile it and run it: https://docs.oracle.com/javase/tutorial/getStarted/cupojava/win32.html

How to determine a java program output without any IDE?

2 Answers2