Final Methods and Template Method Pattern

In this problem: You will implement the Template Method Pattern using final methods, creating an AbstractReport class whose generateReport() method cannot be overridden by subclasses.

Learning Objective: Understand the role of final methods and their relationship to the Template Method Pattern

Overview

In inheritance, adding the final modifier to a parent class method prevents subclasses from overriding it. The Template Method Pattern defines the skeleton of an algorithm in a final method and delegates individual steps to abstract methods implemented by subclasses.

Specifications

AbstractReport Class (abstract)

• final method generateReport(): Calls 3 methods in order:
  1. collectData() - Collect data
  2. formatData() - Format data
  3. printReport() - Print report
• Abstract methods: collectData(), formatData(), printReport()

SalesReport Class (extends AbstractReport)

• collectData(): Prints "Collecting sales data..."
• formatData(): Prints "Formatting sales figures..."
• printReport(): Prints "=== Sales Report ===", "Total Sales: $50,000", "Items Sold: 1,200"

InventoryReport Class (extends AbstractReport)

• collectData(): Prints "Scanning inventory database..."
• formatData(): Prints "Organizing inventory items..."
• printReport(): Prints "=== Inventory Report ===", "Total Items: 5,000", "Low Stock: 23"

Main Class

• Create instances of SalesReport and InventoryReport
• Call generateReport() on each
• Print an empty line between the two reports

Output Format

Collecting sales data...
Formatting sales figures...
=== Sales Report ===
Total Sales: $50,000
Items Sold: 1,200

Scanning inventory database...
Organizing inventory items...
=== Inventory Report ===
Total Items: 5,000
Low Stock: 23