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Course: CIS 110, Fall 2009School: UPenn
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CIS110-203 Intro to Computer Science Lab #7 TA: Catherine Stocker Mentor: Jay Fiddelman University of Pennsylvania 18 October 2007 Today s Agenda Sit in your pair programming groups! General Stuff Inheritance <a href="/keyword/java-api/" >java api</a> Lab Work Monitors Turn em off General Stuff How was the lab work? Let s talk about reuse Inheritance Create one class...
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CIS110-203 Intro to Computer Science Lab #7 TA: Catherine Stocker Mentor: Jay Fiddelman University of Pennsylvania 18 October 2007 Today s Agenda Sit in your pair programming groups! General Stuff Inheritance <a href="/keyword/java-api/" >java api</a> Lab Work Monitors Turn em off General Stuff How was the lab work? Let s talk about reuse Inheritance Create one class and reuse it s methods and variables in it s subclasses. Most common way this is done is : Object class default equals(Object obj), toString(), etc Note that equals takes an Object -- polymorphic <a href="/keyword/java-api/" >java api</a> Application Programming Interface A description of how to use a pre-built set of data structures (Strings, etc) methods/functions (equals()) for building a software application i.e. A promise that there are certain data structures and methods that will work in the specified way You use API s for every homework (javadocs) <a href="/keyword/java-api/" >java api</a> Perfect for all your class and method needs When you downloaded the JDK (Java Development Kit), you were downloading all of those classes described in the API Lucky for you, there were people who already created a String class for you to use and they thought of lots of things for it to do and they tested it and documented it and now all you have to do is look it up. Goes with today s theme of reusing code! <a href="/keyword/java-api/" >java api</a> Explore: Wanna know about what you can do to strings? > String a = "hello" > String b = "hello" > a == b false > a.equals(b) True //why? > a.length() 5 > a.substring(3,5) "lo > a.toUpperCase() "HELLO" >a "hello" Lab Work Break into the same groups, different pairs Betterbot: http://www.seas.upenn.edu/~cis1xx/projects/Botworld/betterbot/assignment.html String Doctor: http://www.seas.upenn.edu/~cis1xx/projects/API/StringClass/StringDr/ Loopingbot: http://www.seas.upenn.edu/~cis1xx/projects/Botworld/loopingbot/assignment.html Later Penn Engineers Without Borders Professor Bernard Amadei Founding President, Engineers Without Borders-USA Co-founder, Engineers Without Borders-International October 18 (Thursday) 6:00 pm 8:00 pm Berger Auditorium (Basement of Skirkanich Hall) Drinks and snacks will be provided For more info, contact: Giselle Dutcher, Penn EWB PR Committee <gisellem@seas.upenn.edu>
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