GeezerVison

GeezerVison is showing dev.java — Your First Steps in Java - Dev.java

Your first Java code

Set up Java, write your first program, and run it in an editor or from the command line.
Using IDEs

Use an IDE to write and run your first Java application.
Launching Simple Source-Code Programs

Launching simple source-code Java programs with the Java launcher.
JShell - The Java Shell Tool

jshell interactively evaluates declarations, statements, and expressions of the Java programming language in a read-eval-print loop (REPL).