Читать книгу OCP Oracle Certified Professional Java SE 17 Developer Study Guide - Jeanne Boyarsky - Страница 71

If you get tired of typing both javac and java every time you want to try a code example, there's a shortcut. You can instead run

java Zoo.java Bronx Zoo

There is a key difference here. When compiling first, you omitted the .java extension when running java. When skipping the explicit compilation step, you include this extension. This feature is called launching single-file source-code programs and is useful for testing or for small programs. The name cleverly tells you that it is designed for when your program is one file.