APCS Unit 6

1
APCS Unit 6

• Methods A Deeper Look

2
Agenda 9/22

• Turn in ch.5 Homework
• Exercise 5.23, 5.27, 5.29
• Chapter 4 5 Quiz
• Turn off your monitor and clear your desk.
• After you complete the quiz
• Read ch.6 Section 6.1-6.5 (pg.231-240)
• Look up one class (your choice) in the Java API
  check the course web site for the link Diagram
  the class in UML (include constructors, methods,
  etc).

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Agenda 9/23

• Review Homework
• Exercise 5.23, 5.27, 5.29
• Chapter 6 - Section 6.1-6.5 (pg.231-240)
• Unit6_Lecture.ppt (Slides 1-25)
• Section 6.6-6.9
• Unit6_Lecture.ppt (Slides 27-46)
• Project 1 Due9/26
• MidTermCh1-6 Tuesday (9/30)

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Agenda 9/23 Cont.

• Homework
• 6.12
• Read Chapter 6 (Sec 6.6-6.9)
• MidTermCh1-6 Tuesday (9/30)

5
Agenda 9/24

• Warm-Up ON A PIECE OF PAPER
• Write a class MinimumFinder containing a method
  which finds the mininum of 4 doubles input by the
  user. The method should be called using another
  class called MinimumFinderTest.
• Review Homework
• Maximum Finder and 6.12
• Recap Section 6.6-6.9
• Unit6_Lecture.ppt (Slides 27-46)

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Agenda 9/24 Cont.

• Homework
• 6.13
• 6.23
• MidTermCh1-6 Tuesday (9/30)

7
Agenda 9/25

• Warm-up
• Debug Warmup6.9
• Review 6.1 6.9
• Static Methods ? Class Methods
• Apply to the class as a whole
• Does your method operate on the state of an
  object?
• If the method DOES NOT modify the instance
  variables of an object it should be declared
  static
• Usable to anyone with access to the class
• Class.Method(Arguments)
• Non Static Methods ? Instance Methods
• Must be invoked on a particular instance of a
  class

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Agenda 9/25

• Static fields ? Class variables
• One copy of the variable is shared among all
  objects in the class
• Often declared as final ? constant variables
• Example In The Math Class
• public static final double PI (all caps to show
  Final variable)
• Public static final double E
• Constant variables used throughout the Math class
• Math.PI Math.E
• Main Method
• Declared static so that it can be invoked without
  creating an instance of the class
• Often just used to test and run applications

9
Agenda 9/25

• Argument Promotion and Casting
• The table shows that the promotions start from
  boolean and go up to double
• There is no promotion for a double

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Agenda 9/25

• Java API Packages
• http//java.sun.com/javase/6/docs/api/
• What is available for use
• Intro to Enumerators
• Craps Example
• Unit6_Lecture ?Slides (48-50)
• Scope
• Create a project in Eclipse and import the
  Fig06_11_12 texbook examples into the project
• Running a program in Debug mode to see the scope
• Unit6_Lecture ?Slides (51-58)

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Agenda 9/25 Cont.

• Homework
• Generate a test driver which uses the Random
  class to generate a distribution (histogram) of
  random numbers between 1 and 10. The program
  should run 10,000 events and output a bar graph
  comprised of a number of asterisks corresponding
  to the distribution bins. Note, make the number
  of asterisks relative (dont output 1,000
  asterisks).
• Extra Credit (up to 5 points added to midterm
  grade)
• Create one turn of the game Yatzee
• Up to 5 die are rolled 3 times
• User decides which die to keep for each roll
• Program generates random numbers for each die
  roll, holding the die identified by the user
• Reference RandomIntegers.java, RollDie.java,
  Craps.java, CrapsTest.java
• MidTermCh1-6 Tuesday (9/30)

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Agenda 9/26

• Warm-up What is the output if the begin method
  is executed
• You need to check ? Slide 60 - Unit6_Lecture.ppt
• Overloaded Methods
• Unit6_Lecture.ppt (Slide 61-65)
• Projects are due today
• Do not Panic
• Print your class files from Eclipse
• Run your program and copy the output from Eclipse
  to a text editor (notepad or word). If it needs
  to be bigger or bold so that the design is more
  visible please make those adjustments.
• Print the Output design from the text editor
• Make sure your name is on the print out and turn
  the papers in with the design stapled on top.

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Agenda 9/26 Cont.

• Homework
• Modify MethodOverload to create an overloaded
  method called square which inputs 2 integers and
  checks that the inputs are the same, then returns
  the square. If the two integers are not the same
  the method prints a message and returns 0.
• 6.30
• MidTermCh1-6 Tuesday (9/30)