How do you add an alert to java?

Question

I already know how on python, c++, CSS and etc.
java is somewhat different then what I'm used to.
Plz check out my codes and give them an up vote if you will,
Thanks.

Answer 1

https://stackoverflow.com/questions/9119481/how-to-present-a-simple-alert-message-in-java

Answer 2

thnx