CompSci 4Review for Exam 2 Nov 8, 2007Prof. Susan RodgerAnnouncements• Start Java next time– We will use Eclipse with Java• Assignment 6 due tonightTopics for the Exam•No HTML• Alice Chapters 1-2,4-7,9-10– Focus on Chap 5-7, 9-10•Topics– Random numbers– Looping structures –Variables– If/else– Lists/ArraysRandom Numbers• Assume they work– Can use = = to compare integers– Use “integer only” if you want an integer– Use “random number” to generate random numbers• Maximum is “up to but not including”• Default valuesLooping Structures• Loop– Simple and complicated•While• When to use “while” vs. “if”Conditionals – If/Else• Formatif (condition)do if trueelsedo if false•Nested ifs• 3 Logical and 6 relational operators• When do you use an “if” vs “while”Variables• Types– Local variable– Parameter– World variable– Class variable• What do you do with a variable?– It stores a value• Initialize it• Use its value• Update itLists• Create a list• Process a list– For all in order– For all together– Item-in-list• List searchArray• Create an Array• Process an array– Loop – complicated version– Use value from array– Set value in array• Search for item in an arrayHow to Study for the Exam• Write methods from old classworks• Lecture notes• Reading quizzes – will make available• Reading in book• Understand the topicsProblem• Objects are a Bunny and a bunch of frogs. They are all facing the same direction. The Bunny is behind the frogs.• The frogs are all in a list called “frogs”• The Bunny and frogs will be moving each time an event occurs. The bunny will move 0.5 meters and the frogs 0.15 meters each time.• When the Bunny is at least the “Bunny’s depth” in front of all the frogs, it should turn around and say “Stop”Animation•Start•FinishWrite function IsBunnyInFront• Returns true if Bunny is at least Bunny’s depth in front of all the frogs in the list frogs• Else returns falseWrite method moveAndCheck• Moves all the frogs in the list frog 0.15m• Moves the bunny 0.5m• If the bunny is in front of all the frogs, turns around and says
View Full Document
Unlocking...