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AP Computer Science A — Practice Questions flashcards

6 of 55 questions free to study here · 4 topics · the whole deck is built into Willys

Multiple-choice practice questions, one best answer each, on Java expressions, Strings, boolean logic, loops, classes, arrays, ArrayList, 2D arrays, searching, sorting and recursion.

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Practice deck · part of AP Computer Science A · written against: College Board AP Computer Science A Course and Exam Description (Java subset; 2025 revision). Updated 2026-10-10.

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6 questions from the deck as they are. Flip, rate yourself, filter by topic; your progress stays in this browser.

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  1. What is printed by the following code?
    double d = 9.7;
    int n = (int) d + (int) -2.4;
    System.out.println(n);

    A) 7
    B) 6
    C) 7.3
    D) 8
    A) 7

    Each cast truncates toward zero, so (int) d is 9 and (int) -2.4 is -2, giving 7. Getting 6 means treating the negative cast as rounding down to -3.
    Using Objects and Methods › Primitive Types and Casting
  2. What is printed by the following code?
    int total = 17;
    int count = 4;
    double avg = total / count;
    System.out.println(avg);

    A) 4.25
    B) 5.0
    C) 4.0
    D) 4
    C) 4.0

    total / count divides two ints, so integer division gives 4 before the value is widened to a double and printed as 4.0. A cast such as (double) total / count would be needed to get 4.25.
    Using Objects and Methods › Primitive Types and Casting
  3. For int variables a and b, which expression is equivalent to !(a < 3 || b != 0)?

    A) a >= 3 && b == 0
    B) a >= 3 || b == 0
    C) a < 3 && b != 0
    D) a > 3 && b == 0
    A) a >= 3 && b == 0

    By De Morgan's law, negating an || gives an && of the negated parts: the negation of a < 3 is a >= 3 and the negation of b != 0 is b == 0. Keeping || negates the parts but forgets to swap the operator.
    Selection and Iteration › Boolean Logic
  4. What is printed by the following code?
    int k = 0;
    boolean b = (k == 0) || (10 / k > 1);
    System.out.println(b);

    A) Nothing; an ArithmeticException is thrown
    B) false
    C) Nothing; the code does not compile
    D) true
    D) true

    The left side of || is true, so short-circuit evaluation skips the right side and the division by zero never happens. The whole expression is true.
    Selection and Iteration › Boolean Logic
  5. The class Thermostat declares private double temp;. Code in a different class runs Thermostat t = new Thermostat(); t.temp = 70.0;. What is the result?

    A) The code compiles but throws an exception when run
    B) The code compiles and sets temp to 70.0
    C) The assignment causes a compile-time error
    D) The code compiles, but the assignment is ignored
    C) The assignment causes a compile-time error

    A private instance variable can be used only by code inside its own class, so the compiler rejects the assignment. Outside code must go through a public method such as a mutator.
    Class Creation › Anatomy of a Class
  6. What is printed by the following code?
    int[] a = {4, 8, 15, 16, 23};
    int s = 0;
    for (int i = 1; i < a.length; i += 2) s += a[i];
    System.out.println(s);

    A) 24
    B) 47
    C) 42
    D) 66
    A) 24

    The loop visits indices 1 and 3 only, adding 8 and 16. Summing the values at the even indices instead would give 42.
    Data Collections › Arrays

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • Topic outline follows the College Board AP Computer Science A Course and Exam Description (revised course, first exam May 2026), Units 1–4 (the AP name is used nominatively; no course or exam text reproduced).
  • Every code trace and compile check was verified by compiling and running the equivalent Java (OpenJDK); behavior checked against the Java SE API documentation (reference only, no text copied).

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