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Lesson 9: Building the Complete Expense Manager App Duration: 60 minutes App Feature: 🎉 Putting It All Together What You’ll Build: A full-featured expense tracking system Prerequisites: Complete Lessons 1-8 What We’ll Learn Today By the end of this lesson, you’ll be able to: ✅ Combine all OOP concepts into one application ✅ Organize code…

Lesson 8: Polymorphism & Abstraction Duration: 50 minutes App Feature: 💳 Supporting Multiple Payment Methods What You’ll Build: Abstract classes for payment methods and interfaces Prerequisites: Complete Lessons 1-7 What We’ll Learn Today By the end of this lesson, you’ll be able to: ✅ Understand polymorphism in depth ✅ Create abstract classes (templates) ✅ Use…

Lesson 7: Inheritance – Different Types of Expenses Duration: 45 minutes App Feature: 🎨 Specialized Expense Types What You’ll Build: Create RecurringExpense and OneTimeExpense classes Prerequisites: Complete Lessons 1-6 What We’ll Learn Today By the end of this lesson, you’ll be able to: ✅ Understand what inheritance means ✅ Create child classes that extend parent…

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Step 1: Create the Accounts Table & Insert Sample Data CREATE TABLE Accounts ( acc_no INT PRIMARY KEY, name VARCHAR(50), balance INT CHECK (balance >= 0) ); INSERT INTO Accounts (acc_no, name, balance) VALUES (101, ‘Alice’, 5000), (102, ‘Bob’, 3000), (103, ‘Charlie’, 7000); Step 2: Atomicity Goal: Transfer money from Alice → Bob, but rollback…