GUISimulator.java edited to be more capable. Have a basic UI in place with button that checks for negative CarPark values. Have the button check all the user inputted values to make sure they are in the correct format. Only one of these errors can occur at a time because java stops the continuation of the method.
GUISimulator.java edited to be more capable with finding negative numbers.
GUISimulator.java added a basic bar graph
Merge pull request #4 from jarade/master

GUISimulator.java edited to be more capable. Have a basic UI in place wi...