Java-Colab.ipynb

Java-Colab.ipynb

How to read inputs!?, when I try to read inputs it doesn't show any input form!

You mean reading inputs from console? The following code works to me:

var scanner = new java.util.Scanner(System.in);
var str = scanner.nextLine();

I'm getting the following error.

NameError Traceback (most recent call last)
in ()
----> 1 System.out.println("Hello world!");

NameError: name 'System' is not defined

@davisjm4 I can't reproduce your error when I follow the instruction in the notebook. Your kernel looks like Python, not Java; it seems that the page was not successfully refreshed.

Wow, it works on my phone even, I'm going to try it on my computer tomorrow, thank you! My students are going to be so excited to be able to take their notes like this:)

…

On Tue, Mar 8, 2022, 7:29 PM Takahiro Ueda ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ @davisjm4 <https://github.com/davisjm4> I can't reproduce your error when I follow the instruction in the notebook. Your kernel looks like Python, not Java; it seems that the page was not successfully refreshed. — Reply to this email directly, view it on GitHub <https://gist.github.com/a200b3f747d0fc864be8b4dd09be5a1e#gistcomment-4090447>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQL4I3HHRGGOXXVSZOGIT7DU7ALIBANCNFSM4VS3KHWQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

followed theinstructions, the code i pasted is running but no output seen. Why?

@jmmanipadam You need to open the notebook file in Colab (copy&paste code doesn't work), because you need to switch the Jupyter Kernel type to "java" (impossible from the Colab UI, saved in the .ipynb file). That is why I made this template notebook.

Does this still currently work? I've been running into the issue of a never-ending "Connecting...". I've been troubleshooting for about a day with no luck.

Oh, now the Java Kernel actually seems to stop at "Connecting"...

SpencerPark/IJava#138
googlecolab/colabtools#3267

See the answer in https://stackoverflow.com/a/74821762 and try his notebook https://colab.research.google.com/gist/SpencerPark/447de114fcd3e6a272dc140809462e30.

For reference, nowadays the easiest way to run Java on Colab would be:

1. Copy and paste 4 lines in https://github.com/jupyter-java#installing-in-online-jupyter-notebooks, and run them.
2. Change runtime type to java (IJava/j!).

Then the above examples work well (including %maven ...).