1. EE2E1. JAVA Programming
Revision Lecture

2. The exam
The EE2E exam comprises both questions about Java programming and questions about (UML) OOD
The paper is in 2 sections – answer 2 out out 4 questions (1 from each section) in 1 and ½ hours

3. Revision The following EE2E1 topics have been covered in lectures
Classes
Inheritance/interfaces
Swing/GUI’s
Files/Streams and Exceptions
Multi-threading
Network Programming

4. Classes Main revision points
The difference between an object and a class
Encapsulation – private, public members
Class instance variables and methods (member functions)
Static and non-static class members
How to refer to a static class member (through the class name) and a non-static member (through the object name)

5. Classes (cont) Main revision points (cont)
Constructors – used for initializing objects
The this self-reference pointer

6. Inheritance Main revision points
Derived class objects inherit base class attributes and contain their own class specific attributes
Abstract classes
Created when it is not sensible to provide an implementation of a particular method
Objects of an abstract class can’t be instantiated
The Object superclass – generic programs

7. Inheritance (cont) Main revision points (cont)
Polymorphism is a key aspect of inheritance
A base class object variable (pointer) can refer to a derived class object
Derived class methods are called via the base class pointer

8. Interfaces Main revision points
Interfaces avoid the use of multiple inheritance
They are similar to abstract classes but contain only methods and not instance variables
Instance objects can’t be instantiated
Useful for generic programming

9. Swing/GUI’s Main revision points
Swing/AWT are the main graphics/GUI libraries
A graphics program comprises graphics containers and components (Frames, Panels, Buttons etc)
Its pretty easy to display graphics and text in graphics containers
A graphics program runs in a separate thread to the main thread and essentially listens for user/event interactions

10. Files/Streams and Exceptions
Main revision points
Java has many classes supporting I/O
A stream is simply a sequence of bytes
Can attach streams to files
Can do I/O on formatted or compressed data by layering appropriate stream objects
File I/O makes extensive use of exceptions for handling error conditions

11. Files/Streams and Exceptions (cont)
Exceptions are the preferred method of error handling
Object oriented approach
Exception objects contain information about the error
The try{} catch{} mechanism is used
Exceptions can be handled locally or thrown on

12. Multi-threading Main revision points
A Java program can execute in separate threads
Java threads can share data
Threads can be initiated by overriding the run() method of the Thread class
Threads can run with a priority which can be set
Threads are time-sliced and threads are pre-empted by threads of equal or higher priority
Synchronised methods – resolves data conflicts when multiple threads access shared objects

13. Network Programming Main revision points Client/Server architecture
A server listens for a client to connect
Java has a Socket class which is an abstraction of a network end point
Reading/writing a socket is the same as reading/writing to a stream attached to a file
A web server provides html for a client’s web browser
For multiple clients, a multi-threaded server is required
Java has a URL class enabling easy network connection via a url

14. Other issues I have not yet received the 2nd programming reports
However, I will try and get them marked before the exam on 14th May
Grades will be displayed on the EE2E1 web site before you sit the exam
I will also combine the 2 programming report marks so you know your overall EE2E1 coursework grade (comprising 25% of the EE2E module) before you sit the exam (hopefully!)

15. FAQ’s Will I have to write any code? Yes but not too much
Will syntax errors be penalised?
No!
Is all the syllabus examinable?
No. Only half but I’m not going to tell you which half!

16. Thank you all very much!
Good luck in the exam!!