Lecture 21 - April 5, 2007

We talked about Lab 22

• using the comparable interface
• that there were two (2) different sort methods you were asked to use
• one (1) you wrote yourself
• (remember: bubble sort, insertion sort, selection sort)
• Arrays.sort
• deadline was extended for those in class who asked for it til 6pm today

We talked about Lab 10 - the Fraction class

• common denominator is just the product of the denominators
• it is necessary to check for a denominator of 0
• setting denominator to 1 is not a good solution when it's found
• printing a error message and returning a 0 is fine
• it is necessary to check for negative numbers when reducing fractions
• if you use the absolute value of the numerator and denominator, it's the same as reducing fractions in which the numerator and denominator are both positive
• it is not adequate to only test for common factors of 2 and 3
• it is adequate to check for common factors up to the square root of the absolute value of the smaller of the numerator and denominator

We went through slides for array material (Chapter 8 in our text book)

• link to my slides with notes (we went through 1-13 in class - going through the remaining slides or reading the chapter material will help you with Monday's lab (there are only 21)
• link to Gaddis slides (he has 70+)
• the CD that came with your text has the code that is referenced in his slides and mine.

Happy Easter!