AP Computer Science Homework Set 4 Arrays and ArrayLists of ...

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P4F. Let’s upgrade the MyPod class. Create a MyPod2 class that uses an ArrayList to store Songs instead of an array. Provide the same functionality as in P4A. P4G. Finally, let’s upgrade the Roster class so that it can accommodate “adding” and “dropping” Students from a roster. Write a Roster2 class called “apComputerScience” that meets the following requirements: a. Roster2 should use an ArrayList called myStudents (instead of an array) to store Student objects. b. A processor method called “addStudent” should be included that will add a given Student to the ArrayList myStudents. The method addStudent should have the following header: public void addStudent ( Student newStudent ) Note that the addStudent method will ultimately call the ArrayList’s .add() method since Student objects are stored in the ArrayList of myStudents. c. A processor method in the Roster class called “dropStudent” with the following header: public void dropStudent ( String lastName ) The method dropStudent should remove the student with the given last name. For example, the following line of code will remove the student “Lew” from the ArrayList myStudents: period1.dropStudent( “Lew” ); d. Write a Roster2Driver that performs the following: i. Creates a Roster2 object called “apComputerScience”, ii. Adds three students using the “addStudent” method, iii. Prints “period1” using Roster2’s toString() method to verify all “added” Students have indeed been added, iv. Calls the “dropStudent” method to drop one of the students in the ArrayList myStudents (i.e. any one of the Students in the class), and v. Prints “apComputerScience” again to view the revised list of Students in the “apComputerScience”. Page 4 AP Computer Science – HW Set 4 Programs http://thecubscientist.com
By the end of the lesson students should be able to: a. Write a class definition that includes instances of another class (class composition) b. Write an object method whose output depends on the object’s instance variables. c. Use arrays and ArrayLists in a class and be able to use either a for or for-each loop to traverse the array or ArrayList. Page 5 AP Computer Science – HW Set 4 Programs http://thecubscientist.com
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Page 3: P4D. Write a program that creates a

AP Computer Science Homework Set 4 Arrays and ArrayLists of ...

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