Computer Science 225
Advanced Programming

Spring 2021, Siena College

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Agenda

• Announcements
  • Office hours update for this week
    • Tuesday 9-10:30 as usual, virtual only this week
    • Wednesday (College holiday) by appointment, in person or virtual (plus review times as mentioned below)
    • Thursday, cancelled due to a conflicting medical appointment
    • Friday 1:30-2:30, as usual, in person or virtual
  • Lab 8: Animation (in Canvas and GitHub)
    • not due until May 4 or 5 depending on your lab section
    • if you have finished the required functionality (as many have) and decide to go back to add some bonus functionality, be sure to let me know so I notice it
    • the threading and animation aspect of this lab is not fair game for the exam this week, but the code refactoring to add a common base class is
  • Problem Set 5
    • some look to be done, others look to be unstarted
    • due tomorrow
  • Final Project
    • groups should now be formed and repositories created
    • Proposals not due until Friday, but you are encouraged to get them in so I can check them sooner
  • Exam 2
    • see the information/study guide shared document
    • Two review times available on Wednesday
      • 10:30-11:30 and 1:30-2:30
      • I'll open the class Zoom link
      • if people are interested in joining in person on the day off, we can probably use our regular classroom and if not will find a place
      • I can record if anyone would like
• In-class exercise (5 points), create a Google document in your shared CSIS 225 folder for your response.
  1. Build a table that lists all of the possible interleavings of the instructions in the notes where Thread A and Thread B concurrently execute an increment and a decrement of the same variable counter.
  2. Suppose the counter variable starts at 0 before any of the statements are executed. Add a column to your table that gives the value of counter after the statements have been executed.
  3. Highlight the rows so that ones for which counter will have the correct final value (that is, the same as it was when we started) in green, and ones that give an incorrect answer in red.
• Handling keyboard events
• repaint frequency
• Bouncing

Terminology

• keyboard focus

Examples

• ArrowBall: handling keyboard events, in this case arrow keys, in a graphics program
• SnowScene (same as before, will modify in class)
• BallTosser: animation with bouncing off the walls and gravity.