Mastering Object-Oriented Programming (OOP) in Dart – 6 Week Learning Journey With Practical Examples

Hello everyone and especially the Steemit Team!

First of all I want to thank to the Steemit Team for bringing challenge seasons to keep the community engaged and to help many to learn new things with new style and concepts. Before moving towards my personal details I will share the topic which I want to cover as a challenge participant.

I want to teach OOP (Object-Oriented Programming) in this challenge. Object-Oriented Programming is the backbone of modern software development. Without mastering OOP principles, learners struggle with Flutter, backend systems, APIs, and large-scale application design.

Many learners understand basic Dart syntax. But they often struggle with structured program design and real-world implementation of concepts like encapsulation, inheritance, polymorphism, and abstraction. This challenge is designed to bridge that gap through a progressive, hands-on learning approach. In this each week builds upon the previous one.

I will be guiding participants from core principles to designing complete mini systems. By combining clear explanations, practical coding tasks, and interactive engagement this project aims to help the community move beyond theory and develop true problem-solving skills using OOP. The goal is not only to teach Dart concepts but to help participants think and design like software developers while contributing high-quality and educational content to the Steemit platform.

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Here is the draft schedule for all the 6 weeks:

Week 1: Introduction to OOP in Dart – Classes & Objects

Topics to be Covered

• Introduction to Object-Oriented Programming
• Creating Classes and Objects in Dart
• Instance Variables and Methods
• Constructors (Default & Parameterized)
• Object Instantiation and Method Calling

Week 1 Assignment

• Create a Student class with name, age, and grade.
• Create a constructor to initialize the values.
• Add a method to display student details.
• Create at least 3 student objects and display their information.
• Explain in your post what OOP means in your own words.

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Week 2: Encapsulation & Data Hiding in Dart

Topics to be Covered

• Private variables using _
• Getters and Setters
• Data validation
• Why Encapsulation is important
• Protecting object state

Week 2 Assignment

• Create a BankAccount class with a private balance.
• Implement deposit and withdraw methods with validation.
• Prevent negative balance or invalid deposits.
• Use getters to display the balance.
• Explain why private variables are important in OOP.

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Week 3: Inheritance & Method Overriding

Topics to be Covered

• Concept of Inheritance
• extends keyword
• Parent and Child Classes
• Method Overriding
• Types of Inheritance (Single, Multilevel, Hierarchical)

Week 3 Assignment

• Create a parent class Employee.
• Create two child classes: Manager and Developer.
• Override a method like calculateSalary() in both.
• Display different salary logic for each class.
• Draw and explain the inheritance structure used.

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Week 4: Runtime Polymorphism in Dart

Topics to be Covered

• Method Overriding and Dynamic Binding
• Parent Reference to Child Object
• Using List<Parent>
• Looping through objects
• How Dart decides method execution at runtime

Week 4 Assignment

• Create a parent class Payment.
• Create child classes: CashPayment, CardPayment, OnlinePayment.
• Store all objects in a List<Payment>.
• Use a loop to call pay() method.
• Explain why different outputs are produced using the same method name.

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Week 5: Abstraction & Abstract Classes

Topics to be Covered

• abstract class in Dart
• Abstract methods
• Why abstraction is important
• Difference between abstraction and inheritance
• Combining abstraction with polymorphism

Week 5 Assignment

• Create an abstract class Login.
• Create two classes: AdminLogin and UserLogin.
• Implement authenticate() method differently.
• Demonstrate usage through parent reference.
• Explain a real-life example of abstraction.

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Week 6: Final OOP Project – Complete Mini System

Topics to be Covered

• Combining all OOP principles
• System design using OOP
• Clean class structure
• Code reusability
• Best practices

Week 6 Assignment

Build a complete mini system such as:

• Banking System
• School Management System
• Hospital Management System
• E-commerce System

The project must include:

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction
• Proper class structure

Participants must:

• Explain their system design
• Show class hierarchy
• Run and display the output
• Describe how OOP principles are applied

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Selection Criteria

Participants will be evaluated based on their understanding of OOP concepts, correct and runnable code implementation. I will check the proper application of encapsulation, inheritance, polymorphism, and abstraction. The code structure, clarity, and logical design will also be considered along with creativity and improvements beyond basic requirements. Clear explanation of the solution and proper presentation are essential. Plagiarism, incomplete work, or submissions without understanding may lead to disqualification.

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My Personal Details

I am Muhammad Faisal. I have a rollercoaster journey on the Steemit platform. I joined Steemit platform in January 2018. And I am an active user of this platform. I have worked in different places. I have run a community as as admin some years ago.

I have worked in the Crypto Academy as the Best Author. Moreover I have given my services in guiding the newcomers as well as in the Steemit Nursery Community.

More about my services for Steemit:

• I worked in the Steemit Pakistan community as a Crypto Professor by sharing information related to crypto to the community.
• I have worked as a Teaching Team in the Season 20 as Flutter Mobile Application Development.
• Moreover I have been selected as the best learner as well for 2024.
• I have given my services as a Club Mentor in the Technology and Development Club.
• I have given my services as an Atlas Ambassador and I have written several guides to use it and they are being used by many on a daily basis.
• I have experience to work as a community curator for the month of April, June, July, August, and September 2025.
• I have worked as a Steem Atlas Challenge Pitch Team in season 24, 25, and 26.

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