Running a Java program, JavaDemo.java

1. Make a directory for Java. mkdir Java
2. Make a directory for each Java program (this keeps them organized)
   mkdir JavaDemo
3. Create the file for JavaDemo.java (same name as the class)
   vi JavaDemo.java
4. To compile the file: javac JavaDemo.java (this creates JavaDemo.class)
5. To run the file: java JavaDemo (this runs the JavaDemo.class file)
6. Make sure the text file "sampleFile.txt" is in the same directory