Learn how to use the Command pattern to encapsulate requests as objects that you can execute alone or in sequence in your Java programs.

Create, view, and modify Java archive files on the command line Learn how to do basic CRUD operations on JAR, WAR, and EAR files using the command line.

In fact, you don’t even have to code your Java into a file. JShell can execute lines of Java code directly on the command line. Java without a main method Historically, Java devs have had to code a ...