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Introduction to Java
February 27, 2008
Introduction to Java February 27, 2008 1 What is Alice? A - - PowerPoint PPT Presentation
Introduction to Java February 27, 2008 1 What is Alice? A - - PowerPoint PPT Presentation
Introduction to Java February 27, 2008 1 What is Alice? A programming environment 2 Tuesday, October 7, 2008 What is Alice? A programming language 3 What is Alice? A library of graphic objects 4 Tuesday, October 7, 2008 What is Alice?
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What is Alice?
A tool that runs animations
What about Java?
A programming environment - BlueJ 5 6 Tuesday, October 7, 2008
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What about Java?
A programming language
What about Java?
A huge library (but less visual)
2D Graphical shapes - circles, lines, ... User interface elements - buttons, sliders, ... Networking Image manipulation... Many, many things
7 8 Tuesday, October 7, 2008
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What about Java?
A tool for running a wide range of applications
Objects
in Alice in Java 9 10 Tuesday, October 7, 2008
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Classes
in Alice in Java
Methods in Alice
11 12 Tuesday, October 7, 2008
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Methods in Java Types
in Alice in Java Number Boolean Object int double boolean Penguin Location Train ... 13 14 Tuesday, October 7, 2008
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Event Handling
in Alice in Java
Creating Objects
in Alice in Java 15 16 Tuesday, October 7, 2008
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Class Method
Anatomy of a Java Class
Parameter Instruction public class FallBreak extends FrameWindowController { public void onMousePress (Location point) { new Text ("Fall break is coming!", 40, 100, canvas); } public void onMouseRelease (Location point) { canvas.clear(); } }
Coordinate System
Coordinates measure pixels, the smallest dot
- f color a display can make
Cartesian coordinates
(0,0) 100
- 100
- 100
100
Display coordinates
(0,0) 100 100
17 18 Tuesday, October 7, 2008
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Methods & Constructors
Method call Constructor call
public class FallBreak extends FrameWindowController { public void onMousePress (Location point) { new Text ("Fall break is coming!", 40, 100, canvas); } public void onMouseRelease (Location point) { canvas.clear(); } }
Event Handling in Alice
Need to tell Alice, which method to call when an event occurs An event can be for any mouse click or only when the mouse clicks on a specific object 19 20 Tuesday, October 7, 2008
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Event Handling
public class FallBreak extends FrameWindowController { public void onMousePress (Location point) { new Text ("Fall break is coming!", 40, 100, canvas); } public void onMouseRelease (Location point) { canvas.clear(); } }
Summary
Many similarities in programming concepts Alice - limited to creating animations Java - wide applicability Alice programming environment - menu, drag&drop eliminates syntax errors, but clumsy Java programming environment - less clumsy, but requires learning syntax