Java - Packaging

The firstly build the nice directory, for example:

C:\project

    |- bin

    |- src

        |- com

            |- lucia

                |- Boo.java

Then compile your java file using:
C:\project javac -d bin src\com\lucia\Boo.java

The above command will make a binary class file inside your bin directory plus the package.

C:\project> javac -d bin -sourcepath src src\com\lucia\Main.java

C:\project> java -cp bin com.lucia.Main
See more on: http://www.ibm.com/developerworks/library/j-classpath-windows/

Java - Packaging