AP Computer Science A Study Guide: Key Concepts for the 2026 Exam
AP Computer Science A tests your Java programming skills and understanding of core CS concepts. Here’s how to prepare for the 2026 exam.
Object-Oriented Programming
Understand classes, objects, inheritance, and polymorphism thoroughly. Know how to write constructors, accessor and mutator methods, and understand the relationship between superclasses and subclasses.
Data Structures
Arrays and ArrayLists are heavily tested. Know how to traverse, search, sort, and modify these structures. Understand 2D arrays and common algorithms like insertion sort and selection sort.
Recursion
Recursion appears on nearly every exam. Practice tracing through recursive calls and writing recursive methods. Understand base cases, recursive cases, and how the call stack works.
Free Response Tips
Write clean, compilable Java code. Even if your algorithm isn’t perfect, correct syntax and proper use of control structures earn partial credit. Practice writing methods that work with arrays, ArrayLists, and 2D arrays under timed conditions.
