Skip to main content
Sign in Create a free account
Varsity Tutors
Sign in Sign up

Practice Test 8 - AP Computer Science A

20 questions. Answer them in any order, then submit to see your score and every explanation.

  1. In the code below, how does the loop condition i < numbers.length affect the loop's execution?
  2. Analyze the following code. What will be the output of the given code? // Scenario: conditional loop finds a value, then reports index int[] data = {4, 7, 7, 9}; int pos = 0; // initialize while (pos < data.length && data[pos] != 7) { pos++; // update } System.out.println(pos);
  3. Which of the following statements best describes the divide-and-conquer strategy used by the merge sort algorithm?
  4. A recursive method counts how many times a number can be halved before reaching 1, for input size nn. public static int halveCount(int n) { if (n <= 1) { return 0; } else { return 1 + halveCount(n / 2); } }What is the run-time complexity of the algorithm in the code snippet?
  5. A programmer is building an application that needs to interact with a remote database over a network. What is the most appropriate and common practice for the programmer to take?
  6. What happens when this code executes? Account acc1 = new Account("Alice", 100.0); Account acc2 = new Account("Bob", 50.0); Account result = BankUtils.transfer(acc1, acc2, 150.0);
  7. Palindrome Checker: What will be the output if the string is "Level"? public class PalTool { public static String check(String word) { word = word.replace(" ", ""); String lower = word.toLowerCase(); String ends = lower.substring(0, 1).toUpperCase() + lower.substring(lower.length() - 1); boolean isPal = true; for (int i = 0; i < lower.length() / 2; i++) { if (lower.charAt(i) != lower.charAt(lower.length() - 1 - i)) { isPal = false; } } return (isPal ? "PAL:" : "NOT:") + ends; } } // Test case: System.out.println(PalTool.check("Level"));
  8. What information do the inline comments provide in this SimpleCalculator divide method's error handling?
  9. A programmer designs a method, calculateArea, that computes the area of a rectangle. The initial version only works for a rectangle with a fixed width of 10 and height of 5. Which of the following modifications would best generalize this method using abstraction?
  10. An algorithm performs a flood fill operation on a 2D character array, replacing all connected cells of the same character with a new character. Using a recursive approach, which modification would be most effective in preventing stack overflow for large connected regions?
  11. A developer is planning to write a program to manage student grades. The data set includes each student's name, ID number, and a list of assignment scores. Before writing the code, the developer creates a table with columns for "Name," "ID," and "Scores." What is the main benefit of this action?
  12. Based on the student grade manager below, which data type is best suited for studentName and why? String studentName = "Ava"; GradeBook gb = new GradeBook(studentName); gb.addScore(90); gb.addScore(85); System.out.println(gb.getAverage());
  13. In a shopping cart discount system, what will be the output if the input is totalAmount = 120? // Apply a 10% discount for orders over $100 int totalAmount = 120; int discountPercent = 0; if (totalAmount > 100) { discountPercent = 10; } System.out.println(discountPercent);
  14. A programmer writes a program that successfully compiles without any issues. What can be concluded with certainty from this fact?
  15. Consider two scenarios: (1) A Manager class extends Employee in the same package, and (2) A PayrollSystem class in a different package. What is true about constructor and method accessibility?
  16. Analyze the following code. // Scenario: process an array until a target is found int[] a = {1, 3, 5, 7, 9}; int index = 0; // initialization while (index < a.length && a[index] != 7) { // condition System.out.println(a[index]); // iterate through sequence index++; // update }What will be the output of the given code?
  17. In the LibraryManager code below, how do the comments enhance the readability and maintainability of the code? import java.util.ArrayList; import java.util.List; /** * A tiny library catalog storing author names alongside titles. * Comments highlight design intent for educational clarity. */ public class LibraryManager { private final List<String> entries = new ArrayList<>(); /** * Adds a book entry in the format "Title - Author". * * @param title the book title * @param author the author name * @return true if the entry is added */ public boolean addBook(String title, String author) { if (title == null || author == null) { // Both fields are required to keep entries consistent. return false; } String t = title.trim(); String a = author.trim(); if (t.isEmpty() || a.isEmpty()) { // Avoid storing incomplete records. return false; } entries.add(t + " - " + a); return true; } /** * Returns all entries that contain the given text. * * @param query the text to search for * @return a list of matching entries */ public List<String> search(String query) { List<String> results = new ArrayList<>(); if (query == null) { return results; } String needle = query.trim().toLowerCase(); for (String entry : entries) { // Normalize case so searches behave consistently for users. if (entry.toLowerCase().contains(needle)) { results.add(entry); } } return results; } }
  18. A teacher stores quiz scores in an array of integers. Given the code snippet, public class Grades { public static void main(String[] args) { int[] grades = new int[5]; // 5 students grades[0] = 90; grades[1] = 85; } }The array stores whole-number scores. How is the array grades initialized in the code?
  19. Consider the Book class shown. The constructor is intended to initialize the instance variables title and author with the values of the parameters that have the same names. Which of the following can replace /* missing code */ so that the constructor works as intended?
  20. In this class, which method call is valid from main? ```java public class MathUtil { private static int factorialIter(int n){ int prod = 1; for(int i=2;i<=n;i++) prod *= i; // multiply up return prod; } public static int factorial(int n){ return factorialIter(n); // delegate } }

Practice tests