1. 1 G54PRG Programming Lecture 1 Amadeo Ascó Adam Moore G54PRG Programming Lecture 1 Amadeo Ascó 3 Java Programming Language

2. 2 Amadeo Ascó, Adam Moore Previously What is a programming language? – Set of grammatical rules for instructing a computer to perform specific tasks Languages by implementation – Machine language; Assembly language – Compiled languages; C, C++ – Interpreted languages; Java Language by paradigm Simple initial design – Divide project into smaller and simpler subprojects – Pseudocode

3. 3 Amadeo Ascó, Adam Moore Overview Whats Java? Some history Characteristics Components Type of programs Development

4. 4 Amadeo Ascó, Adam Moore Whats Java? Java is a programming language Created by Sun Microsystems Often used for web programming – Initially marketed as a web development system – Java is not only for web programming General purpose programming language Very similar to C++ – simplified!

5. 5 Amadeo Ascó, Adam Moore What Else? NOT JAVASCRIPT!!!!

6. 6 Amadeo Ascó, Adam Moore Some history James Gosling - Sun – Started 1991, Launched 1995 – "write once, run anywhere" WORA There were five primary goals : – It should be "simple, object oriented, and familiar". – It should be "robust and secure". – It should be "architecture neutral and portable". – It should execute with "high performance". – It should be "interpreted, threaded, and dynamic". NOT Licensed to Microsoft - $20M

7. 7 Amadeo Ascó, Adam Moore Current 'Flavours' Java SE – Standard Edition Java EE – Enterprise Edition – Servlets Java ME – Micro Edition – Optimised for mobile devices

8. 8 Amadeo Ascó, Adam Moore Characteristics Object Oriented Concurrent Interpreted Modular – There's a library for (nearly) everything! Internationalization - utf8 native Memory Management Error Handling

9. 9 Amadeo Ascó, Adam Moore Components Hardware Operating System Virtual Machine Byte Code

10. 10 Amadeo Ascó, Adam Moore Development / Distribution JDK – Development Toolkit – Compiler – Header Files JRE – Runtime Environment – Just what's needed to execute bytecode

11. 11 Amadeo Ascó, Adam Moore Type of programs Applications – Has an entry point; static main method – Runable in a computer with JVM JVM OS Application Storage Library (y)

12. 12 Amadeo Ascó, Adam Moore Type of programs Applets – GUI applications – Applet is a program written in the Java that can be included in an HTML page Browser Library (y) OS Applet Web Server Storage Library (y)

13. 13 Amadeo Ascó, Adam Moore Servlets – Applications that run on the server side, so has an entry point – Normally used to extend functionality of a Web Type of programs Servlet Web Server Storage JVM OS Library

14. 14 Amadeo Ascó, Adam Moore Libraries – Re-usable code – Cannot be run by itself; doesnt have an entry point Type of programs JVM OS Application Storage Library (y)

15. 15 Amadeo Ascó, Adam Moore Development Java Development Kit (JDK) http://www.oracle.com/technetwork/java/javase/downloads /index.html Eclipse Development Environment Penumbra is in http://wiki.eclipse.org/Eclipse_IDE_for_Education http://wiki.eclipse.org/Eclipse_IDE_for_Education Documentation for Java libraries http://download.oracle.com/javase/6/docs/api/ Tutorial http://download.oracle.com/javase/tutorial/index.html

16. 16 Amadeo Ascó, Adam Moore Eclipse Rapid Application Development Very Powerful Most commonly used RAD today For (just about) all Languages Can be very complex So - we are using Penumbra – Special Educational Edition