how to compile a java program in mac terminal code example

Example 1: How do I compile and run a program in Java on my Mac?

cd ~
javac HelloWorld.java
//for running it
java HelloWorld

Example 2: java in terminal

jshell
|  Welcome to JShell -- Version 12.0.1
|  For an introduction type: /help intro

jshell> int i=99;
i ==> 99

jshell> System.out.println(i);
99