1. Programming Logic
Alice

2. Programming Implementation in Alice

3. Program Style Change program display styles in Preferences
How to access Preferences dialog box
Click the Edit menu
Click the Preferences choice
Selecting a display style in Preferences dialog
Click next to “display my program” in General tab
Select a style
Style recommended for course: Java Style in Color

4. Program Style (continued)

5. Adding Objects to Alice
Class: blueprint for an object
How to populate Alice world with objects
Click Add Objects button in world window
Locate class specifying the object in the Alice Gallery
Right-click class and select “Add instance to world”
Objects in sample world: aliceLiddell and whiteRabbit
Naming conventions for objects and classes
Class: capitalize all words; e.g., AliceLiddell
Object: capitalize all but first word; e.g., aliceLiddell
Objects can be renamed from the object tree

6. Adding Objects to Alice (continued)

7. Accessing Object Subparts
Bounding box: encloses any Alice object
Impact of selecting an object in the object tree
Bounding box is drawn around object in world window
Details area adapts to the selected object
First action to program: Alice turns head to user
First set of programming steps
Select + sign next to aliceLiddell in object tree
Select + sign next to neck subpart
Select head (bounding box is drawn, details change)
Drag doInOrder control to top of editing window

8. Accessing Object Subparts (continued)

9. Accessing Object Subparts (continued)

10. Sending Messages Programs rely on sending messages to objects
Method: behavior-producing message
Programming Alice’s head to turn
Select Alice Liddell’s head in the object tree
Scan through the methods in the details area
Click on pointAt()
Drag pointAt()to the editing area and drop it
Specify camera as the target

11. Sending Messages (continued)

12. Testing and Debugging
Bug: error interfering with normal program functions
Debugging: process of removing program bugs
Click the Play button to test Alice Liddell application
Alice Liddell’s head will turn toward the user

13. Testing and Debugging (continued)

14. Coding the Other Actions
say() message
Displays dialog for an object
Text can be customized by selecting other…
Task: complete first Alice Liddell application
Add Alice Liddell’s initial greeting
Point the white rabbit to the user
Have Alice Liddell introduce herself
Have the white rabbit introduce himself
Customize messages by selecting from more…
Example: adjust fontSize of message text to 30

15. Coding the Other Actions (continued)

16. Statements Statement: a line or control structure in a program
Computer program is a collection of statements
Basic format of a line in a program
object.message(value); more...
Control structures manage other statements
Example: doInOrder contains other statements

17. The Final Action Sequential execution
Actions are performed consecutively
Example: actions executed in doInOrder structures
Simultaneous execution
Actions are performed in parallel
Example: actions performed in doTogether structure
Finishing the first program
Add doTogether control structure to application
Send say( )to aliceLiddell and whiteRabbit
Message value: Welcome to our world

18. The Final Action (continued)

19. Final Testing First set of actions are performed separately
Final actions are performed simultaneously

20. Final Testing (continued)

21. Questions