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Programming II

Programming II - Part 1 – Object Oriented Programming with Java Sebastian Uchitel www.doc.ic.ac.uk/~su2 Course Structure Lectures Room 308. Monday 14:00 and Friday 10:00. Tutorials Room 344 (and 308 if we need more space) Monday 15:00 Lab

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Programming II

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  1. Programming II - Part 1 – Object Oriented Programming with Java Sebastian Uchitel www.doc.ic.ac.uk/~su2

  2. Course Structure • Lectures • Room 308. • Monday 14:00 and Friday 10:00. • Tutorials • Room 344 (and 308 if we need more space) • Monday 15:00 • Lab • 4 labs dedicated to topics covered in Programming II. • Week 2 (unassessed), and weeks 3, 5, and 6. • Assessment • 2 assessed assignments (one for each part of the course) • 2h exam, 3 questions out of 4 © S. Uchitel, 2004

  3. Part I - Aims • Learn concepts and fundamentals of the Object Oriented paradigm. • Apply in a real programming language (Java) these concepts and fundamentals • Learn Java • Practice problem solving using Java and OO principles. © S. Uchitel, 2004

  4. Part I - Textbooks • Java Software Solutions – Foundations of Program Design (3rd ed.), Lewis and Loftus, Addison Wesley. • Thinking in Java (3rd ed.), Bruce Eckel, Prentice Hall. Freely available at http://www.mindview.net/Books/TIJ/ • Java Documentation: • http://java.sun.com/docs/books/tutorial/ • http://java.sun.com/j2se/1.4.2/docs/api/ © S. Uchitel, 2004

  5. Part I - Outline • Introduction • Motivation • From Kenya to Java • Objects and Classes: A User’s Perspective • What are they? • How do I create objects from classes, and how do I use them? • Where do I get classes from in the first place? • Objects and Classes: A Developers Perspective • How do I create my own classes? • How do I design “good” classes? • Inheritance and Polymorphism • Interfaces and Abstract Classes • Collections • Exceptions © S. Uchitel, 2004

  6. Why Object Oriented Programming? • Programming is about two things • Problem solving • Managing complexity • OO Programming provides conceptual framework and programming constructs for managing complexity • In principle with imperative and functional languages you can implement anything but... • Functional languages: input and output? acceptance in industry? • Imperative languages do not manage complexity well. More difficult to understand/maintain/extend. © S. Uchitel, 2004

  7. Why learn Java? • Why Java? • Java is an OO programming language. • Widespread in Industry for development of traditional and web-based applications • Why not Kenya? • Kenya is not an OO programming language. • Developed at Imperial for educational purposes. • Outside Imperial College VERY few people know it. • Not used in Industry • Why not other OO programming languages? • C++? Complex (and confusing) mix between OO and imperative programming, memory management, and more... • Smalltalk? Pure? But, low acceptance in Industry, and more... © S. Uchitel, 2004

  8. From Kenya... void main() { // Requests two numbers and prints the larger println("Type in your 2 numbers -> "); println("The winner is " + bigger(readInt(), readInt())); } int bigger(int a, int b){ //post: returns the larger of the 2 valuesif (a > b) {return a;} else {return b;} } To tool... © S. Uchitel, 2004

  9. ... to Java import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } © S. Uchitel, 2004

  10. From Kenya to Java • By adding the bits and pieces of the previous slide, you can now write Java programs for all the Kenya programs you did in the previous term! • However, in the next 10 lectures you will learn what these bits and pieces are! • Recommendations: • Throw the Kenya compiler away! • Write Java from the very first day! © S. Uchitel, 2004

  11. What’s new: Classes import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Classes (In Java, nearly everything appears within one) © S. Uchitel, 2004

  12. What’s new: Objects import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Objects, object methods and calls © S. Uchitel, 2004

  13. What’s new: Command line parameters import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Command line parameters © S. Uchitel, 2004

  14. What’s new: Packages import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Packages © S. Uchitel, 2004

  15. What’s new: Visibility and Encapsulation import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Visibility & Encapsulation © S. Uchitel, 2004

  16. What’s new: Class scope import kenya.io.InputReader; public classBigger { public static void main(String [] args) { System.out.println("Type in your 2 numbers -> "); System.out.println("The winner is " + bigger(InputReader.readInt(), InputReader.readInt())); } static int bigger(int a, int b){ //post: returns the larger of the 2 values if (a > b) {return a;} else {return b;} } } Class scope © S. Uchitel, 2004

  17. What’s new: Much more! • Inheritance • Polymorphism • Dynamic Binding • Casting • Overloading • Constructors • Abstract Classes • Interfaces • and much more! © S. Uchitel, 2004

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