How do you try Java in your mobile phone?

Answer 1

Your question is related to 'java' but your tag says 'javascript'.
Correct it.

Answer 2

https://www.sololearn.com/Discuss/1768676/?ref=app

Answer 3

SoloLearn has a code playground where you can write and compile simple Java apps. For bigger projects, you will have to download the OracleJDK or the OpenJDK, or some IDE like Eclipse or NetBeans that will help you writing and compiling whole java projects with a lots of debug and editing tools