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

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P4B. Write a program that creates a “ClockStore” class that is able to hold “Clock” objects. You should reuse the Clock class from the previous chapter. The class should meet the following requirements: 1. Write a class “ClockStore” that consists of a private array called “clocksInStock” that can hold 3 Clock objects. 2. Create an instance of class “ClockStore” and populate it with three Clock objects using the Clock’s constructor. You set the time for each Clock. Here’s a sample demonstrating how to place a Clock in the array at position “0”: clocksInStock[0] = new Clock( 12, 30, 45 ); 4. Write a processor method mostSeconds() that returns index of the Clock that has the highest total seconds as calculated by the Clock method totalSeconds(). The ClockStore method mostSeconds() should have the following header: int mostSeconds() 5. Write a toString() method that traverses the array of Clocks using a foreach loop. This should print the time of each clock using each Clock’s toString() method. 6. Write a driver class “ClockDriver” that tests the above methods. P4C. Write a program that creates a “Roster” class that is able to hold “Student” objects. You should reuse the Student class from the previous chapter. The class should meet the following requirements: 1. Write a class “Roster” that consists of a private array of Students. 2. Create an instance of class “Roster” and populate it with three Student objects. 3. Write a Roster findStudentWithMaxGPA() method that traverses the array with a for loop and returns out the name of the student with the max GPA. 4. Write a Roster toString() method prints the name of the student with the maximum GPA (via calling the method findStudentWithMaxGPA(). 5. Write a driver class “RosterDriver” that tests the above methods. Page 2 AP Computer Science – HW Set 4 Programs http://thecubscientist.com
P4D. Write a program that creates an ArrayList of String objects that will hold the names of members of your family. After populating the ArrayList, perform the following: a. Print the number of elements in the ArrayList using the ArrayList “.size()” method. This should be consistent with the number of names in the ArrayList. b. Use a for loop to traverse the ArrayList and print the name of each person on a separate line. c. Use a separate for-each loop to traverse the ArrayList and print the name of each person on a separate line. See LewTube for demonstrations on how to create and use ArrayLists and all of its methods. The line of code below shows how to create an ArrayList of Strings: ArrayList myFamily = new ArrayList() Note that you can create an ArrayList of any type. For example, you can create an ArrayList of MySongs as follows: ArrayList playList = new ArrayList() P4E. Write a program that creates an ArrayList of String objects that will hold the names of the universities to which you are applying (include at least three schools that contain 4 letters…UC’s are easy: UCLA, UCSD, UCSB, or Yale, MITT (the baseball university, or SWIM (the aquatics university). After populating the ArrayList with at least 5 schools, perform the following: a. Print the number of elements in the ArrayList. This should be consistent with the number of schools in the original ArrayList. b. Use a for-each loop to traverse the ArrayList and print the name of each school on a separate line. c. Use a for loop (not a for-each loop), to remove all the schools that have a length of 4. Make sure to test the situation where there are two consecutive schools of length “4” in your ArrayList. d. Print the number of elements in the ArrayList after the removal. Again, this should be consistent with the number of schools remaining in the list. e. Finally, print the names of the schools remaining in the list. Were all of the 4 letters schools properly removed? Page 3 AP Computer Science – HW Set 4 Programs http://thecubscientist.com
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AP Computer Science Homework Set 4 Arrays and ArrayLists of ...

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