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Practice Test 3 - AP Computer Science A

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

  1. Which of the following statements about calling static methods is most accurate?
  2. If Car is a class, which statement best explains the relationship between the Car class and the concept of inheritance in Java?
  3. Analyze the following code. // Scenario: counting loop with an incorrect update int count = 1; // initialization while (count <= 10) { // condition System.out.println(count); count--; // update (intended to increment) }Identify the error in the loop logic.
  4. Consider the following class for bank accounts. The BankAccount class stores an owner name and a balance. It has methods deposit(double amount) and withdraw(double amount) that update the balance. It also has getBalance() that returns the current balance. A program instantiates BankAccount a = new BankAccount("Mia", 100.0); then calls a.deposit(25.0) and a.withdraw(40.0). The expected outputs for getBalance() after these calls reflect the updated balance. If getBalance() is called after the transactions, what is the expected result?
  5. An 'exception' is a specific event that occurs during program execution and disrupts the normal flow of instructions. This event is a type of which broader category of programming error?
  6. A bank app charges a fee only when an account is overdrawn. What will be the output if the input balance is -5? int balance = -5; int fee = 0; // Apply overdraft fee when balance is negative if (balance < 0) { fee = 35; } System.out.println(fee);
  7. Considering the Java class example below, what is the purpose of the constructor? // Car represents a real-world car object. public class Car { // Fields describe state private String make; private String model; private int year; // Constructor public Car(String make, String model, int year) { this.make = make; this.model = model; this.year = year; } // Methods describe behavior public void start() { // start the car } public void stop() { // stop the car } } // Encapsulation keeps fields private and exposes behavior via methods. // Inheritance and polymorphism allow subclasses to reuse and override methods.Based on the class structure presented above, what is the purpose of the constructor in the Java class example?​
  8. What is the time complexity of this recursive binary search on a sorted integer array of size nn? public class Searcher { public static int binarySearch(int[] nums, int target, int low, int high) { if (low > high) { return -1; } int mid = (low + high) / 2; if (nums[mid] == target) { return mid; } if (target < nums[mid]) { return binarySearch(nums, target, low, mid - 1); } else { return binarySearch(nums, target, mid + 1, high); } } }
  9. In the library system, checkAvailability returns whether a Book can be lent; method must not expose fields directly. Which method signature correctly implements checkAvailability?
  10. Problem: Find the first occurrence of pattern in text using a loop (no libraries). Input: text and pattern. Output: first index or -1. Function signature: public static int indexOf(String text, String pattern). Given the problem description above, what is the output of the function when given the input "banana" and "ana"?
  11. Consider three classes: Product (shown above), Electronics extends Product (in the same package), and Store (in a different package). Which statement about member accessibility is correct?
  12. Consider the Counter class. Which statement best describes the incrementShared method?
  13. Consider this method call sequence: Math.abs(-5), Integer.parseInt("123"), "hello".charAt(1). What do these demonstrate about the relationship between static methods, instance methods, and object-oriented design principles?
  14. What value is returned when the maximum is found in the array [10, -4, 6, 6, 2] by traversal?
  15. A student counts duplicate pairs in a list of usernames to find repeats. Given the program below, String[] names = {"ava", "ben", "ava", "cy"}; int pairs = 0; for (int i = 0; i < names.length; i++) { for (int j = i + 1; j < names.length; j++) { if (names[i].equals(names[j])) pairs++; } } System.out.print(pairs);What is the output of the following nested loop?
  16. Consider this code segment: Point p1 = new Point(10, 20); Point p2 = new Point(10, 20); Point result1 = PointProcessor.processPoint(p1, true); Point result2 = PointProcessor.processPoint(p2, false); Which statement correctly describes the final state?
  17. Consider a binary search implementation that has a bug: when calculating the middle index, it uses mid = (low + high) / 2 with integer division, but it always rounds up instead of down when there's a remainder. How does this affect the algorithm's behavior when searching for an element that is NOT in the array?
  18. Analyze the following code. How many times will the loop execute? // Scenario: counting loop prints values from 1 up to 10 int count = 1; // initialize while (count < 10) { // condition System.out.println(count); count++; // update }
  19. A weather monitoring system stores daily temperature readings in an ArrayList<Double> called temperatures. The system needs to identify days with "extreme" temperatures, defined as readings that are more than 2 standard deviations away from the mean. What information must be calculated before identifying extreme temperatures?
  20. In the AP Computer Science A course, which of the following is considered a reference data type?

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