Java all-in-one (almost)

I've created a single java file that demonstrates most of what we're going to be asked to code for the upcoming exam.

• It demonstrates the following
• 
  File input from plain text
• 
  File output to plain text
• 
  File input from binary (deserialization)
• 
  File output to binary (serialization)
• 
  Use of the HashMap Abstract Data Type
• 
  Use of the Collection Abstract Data Type
• 
  Use of an Iterator
• 
  Excetion handling

FileIODemo.java