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AP Computer Science A Past Papers & Drilling: Java Methods, Loops, Arrays, Classes

AP Computer Science A Past Papers & Drilling: Java Methods, Loops, Arrays, Classes

  • 2026-10-12

TUTORZONE ORIGINAL DRILLING MOCK · AP COMPUTER SCIENCE A (JAVA)

Written to the College Board exam format: Section I multiple choice, 42 questions, 1 h 30 min, 55%; Section II free response, 4 questions, 1 h 30 min, 45% (writing Java code). This drilling mock demonstrates 4 Section II questions (methods, loops, arrays, classes) with answers and techniques.

What is in the AP Computer Science A exam?

Direct answer: Section I multiple choice, 42 questions, 1 h 30 min, 55%; Section II free response, 4 questions, 1 h 30 min, 45%.

Hong Kong student drilling AP Computer Science A with Java code on a laptop
Section II free response: 4 questions, 1 h 30 min, 45% – writing Java code.

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01

Assessment at a glance (2027)

Component Content Weighting Duration
Section II (Free Response) 4 questions, write Java code 45% 1 h 30 min
Section I (Multiple Choice) 42 questions, occasional sets 55% 1 h 30 min

AP CSA drilling technique: in Section II write correct method signatures, types and indentation; trace loops writing i and sum each pass. Array indices start at 0.

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How this paper was built

This is a TutorZone original drilling mock: the questions follow the College Board AP Computer Science A format (Section II free response) and the answers are our own, not College Board past papers or marking references.

The loop-trace answer was recomputed programmatically.

Note before you start: this is not a College Board past paper. Your score is a practice score and cannot be converted into an AP score (1-5).
03

Pacing

Section Marks Suggested time What to do first
Section II (Free Response) 45% about 20 min per question methods, control, arrays, classes
Section I (Multiple Choice) 55% about 2 min per question eliminate clearly wrong options

What index do Java arrays start at?

Direct answer: 0.

04

Section II: free-response drilling (4 demonstrated)

Demonstrates Java methods, a for-loop trace, a one-dimensional array, and classes vs objects.

Question 1 (10 marks)

Write a Java method max(a, b) that returns the larger of two integers.

Question 2 (10 marks)

What is the value of sum after the code below?

int sum = 0;
for (int i = 0; i < 5; i++) {
  sum += i;
}

Question 3 (10 marks)

Explain a Java one-dimensional array and write the statement that creates an int array of length 5.

Question 4 (10 marks)

Explain the difference between a class and an object in Java.

What is the difference between a class and an object?

Direct answer: a class is the blueprint; an object is an instance created with new.

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Answers and marks per question

Question 1

int max(int a, int b) {
  if (a > b) return a;
  return b;
}

(10)

Question 2

sum = 0+1+2+3+4 = 10 (10).

Question 3

An array is an indexed (0-based) collection of same-type elements (5); to create:

int[] a = new int[5];

(5).

Question 4

A class is the blueprint describing an object's structure and behaviour (5); an object is an instance of the class, created with new (5).

Which topics does this paper drill?

Direct answer: Java methods, a for-loop trace, one-dimensional arrays, and classes vs objects.

06

Where these marks are usually lost

Mistake What it looks like What it costs Instead
Loop bound off-by-one sum as 15 (i=5) i < 5 means i runs 0..4 sum = 10
1-based index First element a[1] Java arrays are 0-based First element a[0]
Class/object mixed Object as blueprint Class is blueprint, object is instance Class=blueprint, object=instance
07

How to use this paper

First drill: all 4 questions with no references.

Mark it: check signatures, types and loop traces.

Second drill: redo three to seven days later, aiming for a faster finish.

What should I do after drilling this paper?

Direct answer: log questions with wrong loop bounds or index starts; redo in three to seven days; and drill Section I multiple choice.

08

FAQ

Is this a College Board past paper?
No. The questions and answers are TutorZone originals, not College Board past papers or marking references.

What does AP Computer Science A test?
Section I multiple choice, 42 questions, 1 h 30 min, 55%; Section II free response, 4 questions, 1 h 30 min, 45%.

What index do Java arrays start at?
0.

09

Official references

Resource What to check
College Board AP Computer Science A exam page Confirm the format and question counts
https://www.tutorzone.com.hk/en-ap-statistics-mock-2027/ AP Statistics drilling mock

Related: practice area · AP Statistics drilling mock · IGCSE Computer Science Paper 2 drilling mock

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Next step: find a tutor / register as a tutor

After drilling, the hard part is telling a conceptual error from a writing error. Tell us the year group, the school and your available times, and TutorZone will match you with a tutor who knows the HKEAA assessment requirements.

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