1. CSE 1030: Implementing GUI
Mark Shtern

2. Summary
Implementation of Inheritance
Custom Exceptions

3. Introduction to Abstract Classes
In order to postpone the definition of a method, Java allows an abstract method to be declared
An abstract method has a heading, but no method body
The body of the method is defined in the derived classes
The class that contains an abstract method is called an abstract class

4. Abstract Classes Use to declare common characteristics of subclasses
Cannot be instantiated
Declare with the abstract keyword
Use as a superclass for other classes that extend the abstract class
Abstract classes let you define some behaviours; they force your subclasses to provide others

5. Interfaces
An interface is something like an extreme case of an abstract class
However, an interface is not a class
It is a type that can be satisfied by any class that implements the interface
Examples: List, Set, Comparable
The syntax for defining an interface is similar to that of defining a class
Except the word interface is used in place of class
An interface specifies a set of methods that any class that implements the interface must have
It contains method headings and constant definitions only
It contains no instance variables nor any complete method definitions

6. Interfaces
An interface and all of its method headings should be declared public
They cannot be given private
When a class implements an interface, it must make all the methods in the interface public
Because an interface is a type, a method may be written with a parameter of an interface type
That parameter will accept as an argument any class that implements the interface
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7. Interfaces
An interface serves a function similar to a base class, though it is not a base class
A class may implement several interfaces

8. GUI

9. MVC

10. Our goal

11. High-Level Design

12. View

13. View

14. JMenuBar

15. Implementation Model View Controller Store titles Set title
Load menu from model
Controller

16. Implementation GUI Configure menu Create Model Create View
Configure view
Set size
Set default close operation
Make view visible

17. Dynamic Menu
Print Selection

18. Controller

19. Implementation Controller Model View Event Handler
Add menu selection method
View
Register controller for receiving menu selection event

20. Shuffle

21. Implementation View Controller Model Add button
Register controller to receive click event from button
Controller
Modify handler to process button and menu events
Model
Add method for shuffling menu

22. Custom Shape