How the Java program written by Eclipse works in a DOS environment

In general, if the environment variable is not set up, run the program under DOS Error, generally: Error: Could not find or load the main class xxxxx.

However, in the context of the correct environment variables under DOS run Eclipse written Java program will also appear the above error, usually because the eclipse under the automatic inclusion of the package, so the usual:

Javac Xxx.java

Java xxx.class Change

Into:

Javac-d. Xxx.java

Java package name. XXX

So you can

How the Java program written by Eclipse works in a DOS environment