SYSC 3110 Lab 7: Refactoring (Form Template Method)

Overview

This lab recreates and refactors Martin Fowler’s Site example to implement the Template Method Pattern.

Steps Completed

1. Built initial classes with duplicated "getBillableAmount()" logic.
2. Extracted common base computation "getBaseAmount()".
3. Converted "Site" to abstract class defining the template method.
4. Subclasses now implement "getTypeSpecificCharge(base)" as hooks.
5. Verified identical runtime results.

IntelliJ Refactorings Used

• Extract Method
• Make Abstract Class
• Pull Up (if applicable)
• Safe Delete / Reformat Code

Output

Residential bill: 19.0
Industrial bill: 30.0

References

• JetBrains IDEA Refactoring Guide: https://www.jetbrains.com/help/idea/refactoring-source-code.html
• Fowler, M. Form Template Method Example: https://www.refactoring.com/catalog/formTemplateMethod.html