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Java Lab is for AP CSA students

The Java Lab is specifically available for students registered under AP Computer Science A. Please switch to AP CSA or add AP CSA from your dashboard settings.

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AP_CSA

AP Computer Science A
built backwards from May.

AP Computer Science A exam preparation course under CS Future.

Start practising View syllabus
AP Computer Science A
Learning units
13
Structured course progression
Total assessments
210
Diagnostics, practice and mock exams
Practice questions
2,364+
Curriculum-aligned question bank
FRQ support
Yes
Java-based free-response practice
Course roadmap

The full syllabus.

Every unit, every topic. Click a unit to expand it and jump straight into a lesson.

Practice dashboard
Unit 1

Using Objects & Methods

6 topics
Objects
Topic 1

Objects

Open lesson
Method Calls
Topic 2

Method Calls

Open lesson
Parameters
Topic 3

Parameters

Open lesson
Return Types
Topic 4

Return Types

Open lesson
String Methods
Topic 5

String Methods

Open lesson
Math Class
Topic 6

Math Class

Open lesson
Unit 2

Selection & Iteration

6 topics
if Statements
Topic 1

if Statements

Open lesson
if-else
Topic 2

if-else

Open lesson
Nested Conditionals
Topic 3

Nested Conditionals

Open lesson
for Loop
Topic 4

for Loop

Open lesson
while Loop
Topic 5

while Loop

Open lesson
Nested Loops
Topic 6

Nested Loops

Open lesson
Unit 3

Class Creation

6 topics
Classes
Topic 1

Classes

Open lesson
Instance Variables
Topic 2

Instance Variables

Open lesson
Constructors
Topic 3

Constructors

Open lesson
Methods
Topic 4

Methods

Open lesson
Encapsulation
Topic 5

Encapsulation

Open lesson
Access Modifiers
Topic 6

Access Modifiers

Open lesson
Unit 4

Data Collections

6 topics
Arrays
Topic 1

Arrays

Open lesson
Traversing Arrays
Topic 2

Traversing Arrays

Open lesson
ArrayList
Topic 3

ArrayList

Open lesson
2D Arrays
Topic 4

2D Arrays

Open lesson
Searching
Topic 5

Searching

Open lesson
Sorting
Topic 6

Sorting

Open lesson
Unit 5

2D Arrays

15 topics
2D Traversal and Row Processing
Topic 1

2D Traversal and Row Processing

Open lesson
2D boolean Grid Counting and Best Row
Topic 2

2D boolean Grid Counting and Best Row

Open lesson
Border Detection and Single-Pass Summation
Topic 3

Border Detection and Single-Pass Summation

Open lesson
Boundary-Safe Neighbor Testing
Topic 4

Boundary-Safe Neighbor Testing

Open lesson
Column Drop and Horizontal Run Detection
Topic 5

Column Drop and Horizontal Run Detection

Open lesson
Column Traversal and Grid Mutation
Topic 6

Column Traversal and Grid Mutation

Open lesson
Eight-Neighbor Counting with Bounds
Topic 7

Eight-Neighbor Counting with Bounds

Open lesson
Grid Mutation with Clamping and Average
Topic 8

Grid Mutation with Clamping and Average

Open lesson
Grid State Mutation and Game Logic
Topic 9

Grid State Mutation and Game Logic

Open lesson
Neighbor Counts into a New Grid
Topic 10

Neighbor Counts into a New Grid

Open lesson
Row Scanning with a Flag
Topic 11

Row Scanning with a Flag

Open lesson
Row, Column, and Diagonal Sums
Topic 12

Row, Column, and Diagonal Sums

Open lesson
Run Detection Within Rows
Topic 13

Run Detection Within Rows

Open lesson
Saddle Points (Row Max and Column Min)
Topic 14

Saddle Points (Row Max and Column Min)

Open lesson
Transpose and Symmetry
Topic 15

Transpose and Symmetry

Open lesson
Unit 6

ArrayList

15 topics
Accumulation and Filtered Field Extraction
Topic 1

Accumulation and Filtered Field Extraction

Open lesson
ArrayList of Objects with Mutators
Topic 2

ArrayList of Objects with Mutators

Open lesson
ArrayList of Objects with State
Topic 3

ArrayList of Objects with State

Open lesson
Conditional Removal and set
Topic 4

Conditional Removal and set

Open lesson
FIFO Removal from the Front
Topic 5

FIFO Removal from the Front

Open lesson
Filtering Objects into a New List
Topic 6

Filtering Objects into a New List

Open lesson
Filtering and Mutating Objects
Topic 7

Filtering and Mutating Objects

Open lesson
Insertion, Removal, and Search
Topic 8

Insertion, Removal, and Search

Open lesson
Object Accumulation and Safe Removal
Topic 9

Object Accumulation and Safe Removal

Open lesson
Object Lookup and Cross-Object Counting
Topic 10

Object Lookup and Cross-Object Counting

Open lesson
Ordered Insertion
Topic 11

Ordered Insertion

Open lesson
Parallel Lists with Search-or-Add
Topic 12

Parallel Lists with Search-or-Add

Open lesson
Safe Removal During Traversal
Topic 13

Safe Removal During Traversal

Open lesson
Substring-Based Removal
Topic 14

Substring-Based Removal

Open lesson
Union and Intersection Count
Topic 15

Union and Intersection Count

Open lesson
Unit 7

Arrays

15 topics
Accumulation and Two-Pass Average
Topic 1

Accumulation and Two-Pass Average

Open lesson
Adjacent-Pair Distances
Topic 2

Adjacent-Pair Distances

Open lesson
Argmax and Adjacent-Element Comparison
Topic 3

Argmax and Adjacent-Element Comparison

Open lesson
Array Traversal and Linear Search
Topic 4

Array Traversal and Linear Search

Open lesson
Conditional Average and Minimum
Topic 5

Conditional Average and Minimum

Open lesson
Consecutive Runs
Topic 6

Consecutive Runs

Open lesson
Contiguous Segment Sums
Topic 7

Contiguous Segment Sums

Open lesson
Frequency Array (Counting by Index)
Topic 8

Frequency Array (Counting by Index)

Open lesson
In-Place Clamping and Pass Rate
Topic 9

In-Place Clamping and Pass Rate

Open lesson
In-Place Shifting and Pair Counting
Topic 10

In-Place Shifting and Pair Counting

Open lesson
Neighbor Averaging with Boundaries
Topic 11

Neighbor Averaging with Boundaries

Open lesson
New Array Construction and Bounded Search
Topic 12

New Array Construction and Bounded Search

Open lesson
Parallel Arrays and Conditional Build
Topic 13

Parallel Arrays and Conditional Build

Open lesson
Selection Sort and In-Place Swap
Topic 14

Selection Sort and In-Place Swap

Open lesson
Sum, Conditional Count, and Argmin
Topic 15

Sum, Conditional Count, and Argmin

Open lesson
Unit 8

Inheritance

9 topics
Override Adding to Superclass Result
Topic 1

Override Adding to Superclass Result

Open lesson
Override with Inherited Caller
Topic 2

Override with Inherited Caller

Open lesson
Overriding That Calls the Superclass Method
Topic 3

Overriding That Calls the Superclass Method

Open lesson
Overriding That Extends Superclass Output
Topic 4

Overriding That Extends Superclass Output

Open lesson
Overriding a Computation with a Two-Arg Super
Topic 5

Overriding a Computation with a Two-Arg Super

Open lesson
Overriding a Computed Method
Topic 6

Overriding a Computed Method

Open lesson
Overriding and Polymorphism
Topic 7

Overriding and Polymorphism

Open lesson
Stateful Override Adding to Super
Topic 8

Stateful Override Adding to Super

Open lesson
Two Subclasses and Polymorphism
Topic 9

Two Subclasses and Polymorphism

Open lesson
Unit 9

Iteration and Conditionals

10 topics
Consecutive-Run (Streak) Logic
Topic 1

Consecutive-Run (Streak) Logic

Open lesson
Modulo and Range Conditions
Topic 2

Modulo and Range Conditions

Open lesson
Integer Division and Modulo
Topic 3

Integer Division and Modulo

Open lesson
Char Counting and Comparison
Topic 4

Char Counting and Comparison

Open lesson
Modulo Evenness and Sign Counting
Topic 5

Modulo Evenness and Sign Counting

Open lesson
Range Buckets and Tie-Breaking
Topic 6

Range Buckets and Tie-Breaking

Open lesson
Accumulation and Percentage Math
Topic 7

Accumulation and Percentage Math

Open lesson
Tiered Conditional Logic
Topic 8

Tiered Conditional Logic

Open lesson
Compound Boolean and Ordered Rules
Topic 9

Compound Boolean and Ordered Rules

Open lesson
Tiered Cost with a Boolean Surcharge
Topic 10

Tiered Cost with a Boolean Surcharge

Open lesson
Unit 10

Mixed Simulation

5 topics
Object State with Parallel Arrays
Topic 1

Object State with Parallel Arrays

Open lesson
State Updates with Bounds Clamping
Topic 2

State Updates with Bounds Clamping

Open lesson
Grid Movement with Bounds and Sequence Processing
Topic 3

Grid Movement with Bounds and Sequence Processing

Open lesson
String-Based State Machine
Topic 4

String-Based State Machine

Open lesson
Stateful Movement with a Crash Flag
Topic 5

Stateful Movement with a Crash Flag

Open lesson
Unit 11

Recursion

5 topics
Recursive Reduction
Topic 1

Recursive Reduction

Open lesson
Multiplicative Recursion
Topic 2

Multiplicative Recursion

Open lesson
Recursive String Building and Summation
Topic 3

Recursive String Building and Summation

Open lesson
Numeric Digit Recursion
Topic 4

Numeric Digit Recursion

Open lesson
Recursion Over an Array by Index
Topic 5

Recursion Over an Array by Index

Open lesson
Unit 12

Strings and Object Manipulation

10 topics
String Methods and Validation
Topic 1

String Methods and Validation

Open lesson
String Building and Two-Pointer Comparison
Topic 2

String Building and Two-Pointer Comparison

Open lesson
String Length and Case-Insensitive Matching
Topic 3

String Length and Case-Insensitive Matching

Open lesson
indexOf and substring Parsing
Topic 4

indexOf and substring Parsing

Open lesson
Character Scanning and indexOf
Topic 5

Character Scanning and indexOf

Open lesson
Char Arithmetic and Modular Shift
Topic 6

Char Arithmetic and Modular Shift

Open lesson
substring, startsWith, and Case Conversion
Topic 7

substring, startsWith, and Case Conversion

Open lesson
Word Boundaries and Initials
Topic 8

Word Boundaries and Initials

Open lesson
Character Classification and Validation
Topic 9

Character Classification and Validation

Open lesson
Delimiter Counting and Field Extraction
Topic 10

Delimiter Counting and Field Extraction

Open lesson
Unit 13

Writing Classes

14 topics
Object State and Method Writing
Topic 1

Object State and Method Writing

Open lesson
Complete Class Design
Topic 2

Complete Class Design

Open lesson
Conditional State Updates
Topic 3

Conditional State Updates

Open lesson
Complete Class with Conditional Logic
Topic 4

Complete Class with Conditional Logic

Open lesson
Complete Class with Conditional Pricing
Topic 5

Complete Class with Conditional Pricing

Open lesson
Complete Class with an ArrayList Field
Topic 6

Complete Class with an ArrayList Field

Open lesson
Capacity-Limited State Updates
Topic 7

Capacity-Limited State Updates

Open lesson
Clamped State with Helper Delegation
Topic 8

Clamped State with Helper Delegation

Open lesson
Complete Class with Parallel ArrayLists
Topic 9

Complete Class with Parallel ArrayLists

Open lesson
State Tracking with Ratio Comparison
Topic 10

State Tracking with Ratio Comparison

Open lesson
Complete Class with Min and Average
Topic 11

Complete Class with Min and Average

Open lesson
Guarded Deposit and Withdraw
Topic 12

Guarded Deposit and Withdraw

Open lesson
Statistics over an Array Field
Topic 13

Statistics over an Array Field

Open lesson
Vote Counting and Percentage
Topic 14

Vote Counting and Percentage

Open lesson

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