Choose a real-life application or game ideally with Graphic User Interface (not required). Try to apply various Java programming techniques such as inheritance, polymorphism, abstract class, interface, overriding, overloading methods, and exception handling in your Java program. You are supposed to submit a final project report which details the problem description, class design, system functionality and some user manual. Your system will be tested and see if all proposed features work properly.

Bank Account Manager - Create a class called Account which will be an abstract class for three other classes called CheckingAccount, SavingsAccount and BusinessAccount. Add necessary instance variables to each of these classes; create some overriding and overloaded methods; calculate interests for these accounts using different formula;