To create a jar file
 > jar cf weeSeepy.jar *.java

To use a jar file

 > javac -classpath "weeSeepy.jar" Col3.java
 > java Col3

To enable assertions -ea and to disable -da

  > java -ea Col3



To use packages! An example

In linux/ubuntu
 > cd java
 > javac weeSeepy/*/*.java
 > java weeSeepy/test/Col3

In Windows, go to directory weeSeepy\java
 > javac ./weeSeepy/test/TestOr.java
 > java weeSeepy/test/testOr