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Object-Oriented Programming
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Object-Oriented Programming
Classes, objects, inheritance and interfaces. 38 problems · Beginner level.
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38 problems
Encapsulation
✓
Bounded Counter Class
easy
✓
Inventory Class with Encapsulation
medium
✓
Bit Set Class
medium
Inheritance
✓
Constructor Chain with super
medium
data structure classes
✓
Build a Stack Class
easy
✓
Circular Buffer Queue
medium
✓
Build a Singly Linked List Class
medium
✓
Deque Class with a Doubly Linked List
medium
✓
Sparse Vector Class
medium
enums
✓
Traffic Light State Machine with Enum
easy
✓
Enum with Behaviour: Operations
medium
interfaces
✓
Animal Sounds with an Interface
easy
✓
Discount Policies with a Default Method
medium
static members
✓
Static Counter: ID Generator
easy
value objects
✓
Vector2D Class
easy
✓
Clock Time Class
medium
✓
Interval Class: Overlap and Union
medium
✓
Rectangle Class: Intersection and Containment
medium
classes and encapsulation
✓
Bank Account Simulator
medium
inheritance and polymorphism
✓
Shape Areas with Polymorphism
medium
✓
Payroll with Inheritance and Method Overriding
medium
object equality
✓
Count Unique Points (equals and hashCode)
medium
classes and immutability
✓
Fraction Class Calculator
medium
comparable and comparator
✓
Sort Students with a Comparator
medium
generics
✓
Generic Pair Class
medium
✓
Generic Maximum with a Type Bound
medium
✓
Number Stack with a Bounded Type
medium
immutability
✓
Immutable Money Class
medium
classes and operations
✓
Complex Number Class
medium
✓
Polynomial Class: Add and Multiply
hard
abstract classes
✓
Toll Calculator (Polymorphism)
medium
comparator
✓
Sort with a Chain of Comparators
medium
object modelling
✓
Library Lending with Classes
medium
iterators
✓
Custom Iterator: Stepped Range
medium
copying objects
✓
Copying a Playlist: Deep Copy
medium
classes with rules
✓
Matrix Class with Dimension Checks
medium
composition
✓
Counting Set Wrapper (Composition)
medium
bit flags
✓
Permission Flags with Bits
medium