Object-Oriented Programming (OOP) Course in Java
Our Fundamentals of Object Oriented Programming course covers classes and objects, constructors and destructors, encapsulation, inheritance, polymorphism and abstraction, operator overloading, templates or generics, exception handling and file I/O, in C++, Java or Python to match your course. Lessons are live and one-to-one with a verified subject expert, who explains each concept with worked examples, solves problems from your own module and helps you prepare for exams and coursework. Suitable for computer science and engineering students, following university syllabi in the UK, US, Australia and India (including AKTU, VTU and Anna University style courses).
Reviewed by A. Shinde, Computer science and full-stack development specialistLast updated
$14 – $34
per hour
Free demo class · pay only if you continue
What you will learn
Learning outcomes
- Understand object-oriented programming concepts
- Create classes and objects
- Use constructors and methods
- Apply encapsulation and data hiding
- Implement inheritance
- Understand polymorphism
- Apply abstraction and interfaces
- Handle exceptions
- Design reusable and maintainable programs
Prerequisites
- Basic programming knowledge
- Variables and data types
- Conditional statements
- Loops
- Functions
- Basic problem-solving skills
Tags
Course structure
Syllabus(9 modules)
- Computer systems
- Machine language
- Assembly language
- High-level languages
- Flowcharts and algorithms
What is Object-Oriented Programming?
In short: this course gives one-to-one online tutoring in object-oriented programming. A verified tutor teaches classes, objects, encapsulation, inheritance, polymorphism and abstraction in Java, C++ or Python, and reviews your own designs and code.
Object-oriented programming (OOP) is a style of programming that organises software around objects, which bundle data (fields) and behaviour (methods), rather than around functions alone. Its four pillars are encapsulation, abstraction, inheritance and polymorphism. This course teaches OOP fundamentals using Java, the language most university OOP modules use.
This online course teaches Object-Oriented Programming one to one with a verified tutor who has studied or taught it at university level, at your pace and aligned with your own module.
Related subject: Computer science help.
What does the Object-Oriented Programming course cover?
| Topic | Key content |
|---|---|
| Introduction | Computer systems, machine, assembly and high-level languages, flowcharts and algorithms |
| The Java environment | Java compiler and JVM, structure of a Java program, portability |
| Programming elements | Data types, variables, arrays, operators, selection and loops, strings, input and output |
| Classes | Objects, access control, constructors, methods, overloading, recursion, static members |
| Dynamic memory | References, objects in memory, dynamic allocation, garbage collection, comparison with C++ pointers |
| Inheritance | Superclasses and subclasses, method overriding, run-time polymorphism, abstract classes, final |
| Packages and interfaces | Defining packages, access protection, defining and implementing interfaces |
| Exception handling | Exception types, try, catch, finally, throw and throws, custom exceptions |
| GUI basics | Introduction to graphical programs in Java |
What are the four pillars of OOP?
| Pillar | Meaning | Java example |
|---|---|---|
| Encapsulation | Keep data private and expose it through methods | private fields with getters and setters |
| Abstraction | Show only essential features | abstract classes and interfaces |
| Inheritance | Reuse and extend existing classes | class Car extends Vehicle |
| Polymorphism | One interface, many forms | method overriding and overloading |
How do you design a class well?
- Identify the object's responsibility in one sentence.
- Choose private fields for its data.
- Write constructors that create valid objects.
- Add public methods for behaviour, not just getters and setters.
- Use inheritance only for true 'is-a' relationships; prefer composition otherwise.
- Test each method with small examples.
What does a worked OOP design look like?
Here is a typical design: model shapes that can each calculate their area.
| Class | Role | Key method |
|---|---|---|
| Shape (abstract) | Common parent | area() |
| Circle | Extends Shape, stores radius | area() = π × r² |
| Rectangle | Extends Shape, stores width and height | area() = width × height |
A list of Shape objects can call area() on each one: that is polymorphism.
Where do students lose marks in Object-Oriented Programming?
Students most often lose marks in Object-Oriented Programming through the habits below. Each is easy to fix with practice and feedback on your own code.
| Mark-loser | What to do instead |
|---|---|
| Public fields everywhere | Use private fields with getters and setters |
| Inheritance for code reuse only | Use it for true is-a relationships |
| God classes | Give each class one responsibility |
| Overloading and overriding confused | Overriding changes inherited behaviour; overloading changes parameters |
| No constructors | Initialise objects in constructors |
How is it assessed, and how can a tutor help?
OOP modules are usually assessed by programming assignments and lab tests in Java, plus a written or practical exam on concepts and code tracing.
Tutors explain concepts, work through practice problems with you and give feedback on your approach. Graded work you submit must be your own, as set out in our academic integrity policy. For deadline-driven guidance, see assignment help.
How the lessons work
Lessons are live and one to one on video with screen sharing and a shared whiteboard. You can follow a full course or book sessions on the topics you find hardest before exams. See also Java Programming, Object Oriented Analysis and Design and our Java subject page.
Object-oriented programming for placements: who this course is for, prerequisites and study plan
Object-oriented programming for placements means being able to explain and code encapsulation, inheritance, polymorphism and abstraction clearly in interviews and online tests, and this course builds that skill in Java with a 1-to-1 tutor.
This course suits first- and second-year computer science and IT students taking an OOP module, and final-year students preparing for campus placements.
Prerequisites: basic programming, including variables, conditions, loops and functions.
Course length: 32 one-hour lessons across 9 modules.
| Stage | Modules | What you can do afterwards |
|---|---|---|
| 1 | Introduction, the Java environment, programming elements | Write and run Java programs |
| 2 | Classes in Java, dynamic memory | Design classes with constructors and understand objects in memory |
| 3 | Inheritance, packages and interfaces | Use inheritance, abstract classes, interfaces and polymorphism |
| 4 | Exception handling, GUI basics | Handle errors cleanly and build a simple interface |
Where it leads: continue with our Java Programming course or Object-Oriented Analysis and Design.
Object-Oriented Programming (OOP) Course in Java: frequently asked questions
What is object-oriented programming?
A programming style that organises code around objects combining data and behaviour.
What is the difference between a class and an object?
A class is a blueprint; an object is an instance created from it.
What is polymorphism?
The ability of one interface or method name to behave differently for different types.
What is the difference between an abstract class and an interface?
An abstract class can hold state and implemented methods; an interface defines a contract a class implements, and a class can implement many interfaces.
What is method overloading versus overriding?
Overloading uses the same name with different parameters; overriding redefines an inherited method.
Why does Java not use pointers?
Java uses references and garbage collection instead of manual pointers for safety.
Can you help with OOP lab assignments?
Tutors explain concepts and review your code; the work you submit must be your own.
Is this course for beginners?
Yes. It starts from programming basics before moving to OOP.
How much does an OOP tutor cost?
The price depends on the tutor and session length. You see the hourly rate before booking, with no subscription.
Can a tutor do my assignment for me?
No. Tutors explain, guide and give feedback so you can complete your own work, in line with our academic integrity policy.
What are the four pillars of OOP?
Encapsulation, inheritance, polymorphism and abstraction.
What is encapsulation?
Keeping data private and exposing behaviour through methods.
Which language is 100% object-oriented?
Few mainstream languages are 100% object-oriented. Smalltalk is often given as the classic example, because everything in it is an object. Java is not purely object-oriented, because it has primitive types such as int and supports static methods. C++ and Python are multi-paradigm languages that support object-oriented and other styles.
What is a constructor?
A special method that initialises a new object.
What is composition?
Building classes from other objects, a has-a relationship.
Who is the father of object-oriented programming?
Alan Kay is often called the father of object-oriented programming, because he coined the term while developing Smalltalk in the 1970s. Ole-Johan Dahl and Kristen Nygaard created Simula in the 1960s, the first language with classes and objects, so they are also credited as its founders.
What is this in OOP?
A reference to the current object.
Can you review my class design?
Yes. Tutors review your classes and explain improvements.
Is object-oriented programming still relevant?
Yes. Object-oriented programming is still used across Java, C++, C# and Python, and most large applications, games and Android apps are built with classes and objects. Modern code often mixes it with functional ideas, but encapsulation, inheritance and polymorphism remain core skills in university courses and job interviews. Your tutor teaches them through real code.
Do you offer lessons in my time zone?
Yes. Lessons are online, so you can book times that suit your time zone.
Which OOP questions are asked in placement interviews?
Common OOP placement questions ask you to explain the four pillars, the difference between an abstract class and an interface, method overloading versus overriding, constructors, and composition versus inheritance, often with a short code example. Some tests also ask you to design simple classes. Your tutor runs mock questions until your answers are clear and quick.
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