Introduction to Programming with Greenfoot

Introduction 1 Chapter 1 Getting to know Greenfoot 3 1.1 Getting started 3 1.2 Objects and classes 4 1.3 Interacting with objects 6 1.4 Return types 7 1.5 Parameters 8 1.6 Greenfoot execution 9 1.7 A second example 10 1.8 Understanding the class diagram 10 1.9 Playing with Asteroids 12 1.10 Source code 13 1.11 Summary 15 Chapter 2 The first program: Little Crab 16 2.1 The Little Crab scenario 16 2.2 Making the crab move 18 2.3 Turning 19 2.4 Dealing with screen edges 21 2.5 Summary of programming techniques 25 Chapter 3 Improving the Crab-more sophisticated programming 27 3.1 Adding random behavior 27 3.2 Adding worms 30 3.3 Eating worms 32 3.4 Creating new methods 33 3.5 Adding a Lobster 36 3.6 Keyboard control 36 3.7 Ending the game 38 3.8 Adding sound 40 3.9 Summary of programming techniques 42 Chapter 4 Finishing the crab game 43 4.1 Adding objects automatically 43 4.2 Creating new objects 45 4.3 Animating images 46 4.4 Greenfoot images 47 4.5 Instance variables (fields) 48 4.6 Assignment 49 4.7 Using actor constructors 50 4.8 Alternating the images 52 4.9 The if/else statement 53 4.10 Counting worms 53 4.11 More ideas 55 4.12 Summary of programming techniques 56 Interlude 1 Sharing your scenarios 57 I1.1 Exporting your scenario 57 I1.2 Export to application 57 I1.3 Export to a web page 58 I1.4 Publishing on the Greenfoot Gallery 59 Chapter 5 Making music: An on-screen piano 61 5.1 Animating the key 62 5.2 Producing the sound 65 5.3 Abstraction: Creating multiple keys 66 5.4 Building the piano 68 5.5 Using loops: The while loop 69 5.6 Using arrays 72 5.7 Summary of programming techniques 76 Chapter 6 Interacting objects: Newton's Lab 78 6.1 The starting point: Newton's Lab 79 6.2 Helper classes: SmoothMover and Vector 80 6.3 The existing Body class 83 6.4 First extension: Creating movement 85 6.5 Using Java library classes 86 6.6 Adding gravitational force 87 6.7 The List type 90 6.8 The for-each loop 91 6.9 Applying gravity 93 6.10 Trying it out 95 6.11 Gravity

Michael Kolling is a professor at the Computing Laboratory, University of Kent, in Canterbury, UK. He holds a PhD in computer science from Sydney University, and has worked in Australia, Denmark and the UK. Michael's research interests are in the areas of object-oriented systems, programming languages, software tools, computing education and HCI. He has published numerous papers on object-orientation and computing education topics and is co-author of a Java textbook (Objects First with Java, Pearson Education, 2008.(ISBN 0-13-606086-2). Michael is one of the developers of BlueJ, an educational programming environment, and more recently, the Greenfoot platform. The Higher Education Academy elected Michael as a National Teaching Fellow in 2008.