A quick introduction to Java programming for people who want to do interesting stuff without becoming a real programmer... that's the rest of us.

1. Java Programming (for designers)

2. What is a Program? A list of detailed instructions that the computer carries out To make a cup of coffee the following would not be sufficient: The instructions would have to be much more detailed: You have to say exactly what to do in the right order with no ambiguity 1. Boil water 2. Put coffee in cup 3. Pour in hot water 4. Add milk 1.1. Go to kettle 1.2. Check kettle has water in it 1.3. If not 1.3.1 Take kettle to cold tap 1.3.2 Remove lid of kettle 1.3.3 Put kettle under cold tap 1.3.4 Turn on tap 1.3.5 When kettle full turn off tap 1.3.6 Return kettle to worktop 1.4. Plug kettle into mains 1.5.Switch on electricity …… .

17. Running a Java Application Write Java code javac MyProg.java java MyProg Java code: MyProg.java Bytecode: MyProg.class IDE or Text Editor Output Save the file with a .java extension Run the Java compiler ' javac ' Execute the bytecode with the command ' java ' This creates a file of bytecode with a .class extension User to interact with the system Program to execute and produce a data set, graphs, etc.

19. What does it mean? import java.awt.*; import java.applet.Applet; public class Greetings extends Applet { public void paint(Graphics g) { g.drawString("Hello World!", 50, 50); } } These 2 lines tell the computer to include (import) two standard libraries awt (Abstract Window Toolkit) and applet. This line tells the computer to display some text (a string) on the screen. This line announces that the program (class) can be run by anyone (public), is called Greetings and is an Applet. This line declares what follows in the { } as a method called paint. This is where it is displayed in pixels across and down from the top left hand corner This is what is displayed

22. An Applet is a Panel is a Container… is an Object java.lang.Object | +----java.awt.Component | +----java.awt.Container | +----java.awt.Panel | +----java.applet.Applet … so you can do things with it that you’d do with applets, panels, containers, components, and objects.

23. Object Oriented (OO) Programming A key aspect is Inheritance . You don’t have to describe similar objects completely. You can define a superclass (sometimes called base class ) that has the common attributes and methods and inherit these adding only the ones that are different. Vehicle Bus Lorry Attributes: Speed, Colour Methods: Start, Stop Attributes: Max Load Methods: Pick up Load Attributes: Max Passengers Methods: Pick up Passengers These are inherited

30. Example An Evolutionary Design System