61A Lecture 16Wednesday, October 5Wednesday, October 5, 2011Policy Changes Based on the Survey2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. 2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own first2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.•Your job: Keep asking all your questions; I'll answer fewer2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.•Your job: Keep asking all your questions; I'll answer fewerCode examples distributed in lecture2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.•Your job: Keep asking all your questions; I'll answer fewerCode examples distributed in lecture•Code examples are always on the course website2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.•Your job: Keep asking all your questions; I'll answer fewerCode examples distributed in lecture•Code examples are always on the course website•Homework solutions are also online 2Wednesday, October 5, 2011Policy Changes Based on the SurveyHomework can now be completed in pairs, if you wish. •Every individual should still submit his/her own homework•Please write your partner's name at the top of your file•I strongly recommend that you try problems on your own firstSome questions will be deferred to office hours & after class•Deferred: Questions about related topics, extensions, etc.•Answered: Clarifications, examples, confusions, etc.•Your job: Keep asking all your questions; I'll answer fewerCode examples distributed in lecture•Code examples are always on the course website•Homework solutions are also online •I'll print out the code on code-intensive days2Wednesday, October 5, 2011Implementing an Object System3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?•What is an instance?3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?•What is an instance?•How do we create inheritance relationships?3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?•What is an instance?•How do we create inheritance relationships?•How do we write code for attribute look-up procedures?3Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?•What is an instance?•How do we create inheritance relationships?•How do we write code for attribute look-up procedures?3Tools we'll use:Wednesday, October 5, 2011Implementing an Object SystemToday's topics:•What is a class?•What is an instance?•How do we create inheritance relationships?•How do we write code for attribute look-up procedures?3Tools we'll use:•Dispatch dictionariesWednesday, October 5, 2011Implementing an