AP Computer Science A FRQ Practice

💻AP Computer Science A

Each FRQ type tests specific skills taught in particular units. Here's why certain units appear for each question type:

FRQ	Focus	Units	Why
FRQ 1	Methods and Control Structures	1-2	Tests method writing, loops, conditionals - foundational programming from Units 1-2
FRQ 2	Class Design	3	Tests class design, constructors, instance variables - all Unit 3 OOP content
FRQ 3	Data Analysis with ArrayList	4	Tests using, analyzing, and manipulating data in an ArrayList - Unit 4 content
FRQ 4	2D Array	4	Tests 2D array traversal and manipulation - Unit 4 content

This mapping reflects College Board's exam structure - each FRQ type tests specific skills that are taught in particular units.

Practice FRQ 1 of 201/20

3. The Book class is used to store information about a book in a library. A partial declaration of the Book class is shown.

</>Java

public class Book
{
    /**
     * Returns the genre of the book
     */
    public String getGenre()
    { /* implementation not shown */ }

    /**
     * Returns the number of pages in the book
     */
    public int getPages()
    { /* implementation not shown */ }

    /**
     * Returns true if the book is currently available to be borrowed
     * and returns false otherwise
     */
    public boolean isAvailable()
    { /* implementation not shown */ }

    /* There may be instance variables, constructors, and
       methods that are not shown. */
}

</>Java

public class Library
{
    /** The list of all books in the library */
    private ArrayList<Book> collection;

    /**
     * Returns the average number of pages of the available books
     * in collection whose genre is equal to targetGenre
     * Precondition: targetGenre is not null
     *               At least one available element of
     *               collection has a genre equal to targetGenre.
     *               No elements of collection are null.
     */
    public double averagePagesForGenre(String targetGenre)
    { /* to be implemented */}

    /* There may be instance variables, constructors, and methods
       that are not shown. */
}

Write the Library method averagePagesForGenre. The method should return the average number of pages of the available books in collection that match the parameter targetGenre.

Suppose collection contains the following five Book objects.

Title	"The Hobbit"	"1984"	"The Alchemist"	"Harry Potter"	"Foundation"
Genre	"Fantasy"	"SciFi"	"Fantasy"	"Fantasy"	"SciFi"
Pages	300	320	200	405	250
Is Available	true	true	false	true	true

Call: averagePagesForGenre("Fantasy")
Return Value: 352.5
Explanation: which is equal to the average number of pages of the available books with the genre "Fantasy" (300 pages for "The Hobbit" and 405 pages for "Harry Potter"). "The Alchemist" is a "Fantasy" book but is not available, so it is not included in the calculation. (300 + 405) / 2.0 = 352.5.

Complete method averagePagesForGenre.

</>Java

/**
 * Returns the average number of pages of the available books
 * in collection whose genre is equal to targetGenre
 * Precondition: targetGenre is not null
 *               At least one available element of
 *               collection has a genre equal to targetGenre.
 *               No elements of collection are null.
 */
public double averagePagesForGenre(String targetGenre)

Timed

00:00

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💻AP Computer Science A

Each FRQ type tests specific skills taught in particular units. Here's why certain units appear for each question type:

FRQ	Focus	Units	Why
FRQ 1	Methods and Control Structures	1-2	Tests method writing, loops, conditionals - foundational programming from Units 1-2
FRQ 2	Class Design	3	Tests class design, constructors, instance variables - all Unit 3 OOP content
FRQ 3	Data Analysis with ArrayList	4	Tests using, analyzing, and manipulating data in an ArrayList - Unit 4 content
FRQ 4	2D Array	4	Tests 2D array traversal and manipulation - Unit 4 content

This mapping reflects College Board's exam structure - each FRQ type tests specific skills that are taught in particular units.

Practice FRQ 1 of 201/20

3. The Book class is used to store information about a book in a library. A partial declaration of the Book class is shown.

</>Java

public class Book
{
    /**
     * Returns the genre of the book
     */
    public String getGenre()
    { /* implementation not shown */ }

    /**
     * Returns the number of pages in the book
     */
    public int getPages()
    { /* implementation not shown */ }

    /**
     * Returns true if the book is currently available to be borrowed
     * and returns false otherwise
     */
    public boolean isAvailable()
    { /* implementation not shown */ }

    /* There may be instance variables, constructors, and
       methods that are not shown. */
}

</>Java

public class Library
{
    /** The list of all books in the library */
    private ArrayList<Book> collection;

    /**
     * Returns the average number of pages of the available books
     * in collection whose genre is equal to targetGenre
     * Precondition: targetGenre is not null
     *               At least one available element of
     *               collection has a genre equal to targetGenre.
     *               No elements of collection are null.
     */
    public double averagePagesForGenre(String targetGenre)
    { /* to be implemented */}

    /* There may be instance variables, constructors, and methods
       that are not shown. */
}

Write the Library method averagePagesForGenre. The method should return the average number of pages of the available books in collection that match the parameter targetGenre.

Suppose collection contains the following five Book objects.

Title	"The Hobbit"	"1984"	"The Alchemist"	"Harry Potter"	"Foundation"
Genre	"Fantasy"	"SciFi"	"Fantasy"	"Fantasy"	"SciFi"
Pages	300	320	200	405	250
Is Available	true	true	false	true	true

Call: averagePagesForGenre("Fantasy")
Return Value: 352.5
Explanation: which is equal to the average number of pages of the available books with the genre "Fantasy" (300 pages for "The Hobbit" and 405 pages for "Harry Potter"). "The Alchemist" is a "Fantasy" book but is not available, so it is not included in the calculation. (300 + 405) / 2.0 = 352.5.

Complete method averagePagesForGenre.

</>Java

/**
 * Returns the average number of pages of the available books
 * in collection whose genre is equal to targetGenre
 * Precondition: targetGenre is not null
 *               At least one available element of
 *               collection has a genre equal to targetGenre.
 *               No elements of collection are null.
 */
public double averagePagesForGenre(String targetGenre)

Timed

00:00

Response auto-saves

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