JShell helps developers to quickly test java code snippets in an interactive shell. Many other languages (Python, ..) also have such interactive shells. Java introduced JShell in as part of JDK 9.
Here is a sample JShell session I tried:
I haven't read and tried everything thats possible in JShell, gave a cursory read of https://docs.oracle.com/javase/9/jshell/toc.htm. I felt this resource was quite useful and covers JShell capabilities reasonably.
References:
https://docs.oracle.com/javase/9/jshell/toc.htm
https://developers.redhat.com/blog/2017/10/03/use-jshell-command-line-tool-introduced-jdk-9/
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