Class 08: Building Graphical Programs

Held Friday, February 5

Summary

• Applications and Applets
• The AWT
• Drawing commands
• Assignment 3 distributed. Due Friday, February 12.
• Lab: G1: Graphics and Applets

Contents

Notes

• Today will be mostly lab, and little discussion.
• Some notes on assignment 2 are now available. I'll return assignment 2 on Monday.
  • Because the answer key is available, I will no longer accept assignments.
• I've graded assignment 1 (or at least most of the copies I received). Everyone should read my notes on assignment 1.
• I've graded the quizzes. Here's what I would have expected as an answer to ``Write an isWinter method that determines whether the current date is between Dec. 21 and March 20 (inclusive), without using if or other control structures.'' (Comments are not necessary.)

     /**
      * Determine whether the current date is between Dec. 21 and 
      * March 20 (inclusive). 
      */
     public boolean isWinter() {
       return ( ((this.month == 12) && (this.day >= 21)) || 
                (this.month == 1) || (this.month == 2) ||  
                ((this.month == 3) && (this.day <= 20)) );
     } // isWinter()
  

  • The quiz is worth one ``unit'' of extra credit. I have not yet determined a mapping between units of extra credit and extra credit points, although two units typically equal one point.
  • I'd prefer that you include parens, even when they're not strictly necessary.
• You had a thought assignment for today: what do you expect to find as common errors in loops?

Lab

Do G1.1., G1.2 (only step 1), G1.3, and (if time permits) G1.5.

History

• Created Monday, January 11, 1999.
• Added short summary on Friday, January 22, 1999.
• Added notes section on Friday, February 5, 1999.