Walkthrough - Kotlin Tour: Objects

In this lesson, we explored Kotlin's unique "Object" features, which provide a first-class way to handle singletons and shared state without the complexity of traditional patterns.

Changes Made

Implementation

Created Objects.kt which implements:
- Object Declarations (Singletons): The DoAuth object, created lazily and thread-safely.
- Data Objects: The AppConfig object, providing a clean toString() for singleton data.
- Companion Objects: The BigBen class with a named companion object Bonger to share functionality across instances.
- Exercises:
  - OrderOne and OrderTwo data objects implementing the Order interface.
  - FlyingSkateboard object inheriting from the Vehicle interface.
  - TourUser with a companion object for email validation.
Updated App.java to:
- Call the demonstration function.
- Interact with Kotlin objects from Java using INSTANCE and Companion (or named companion) accessors.

Verification

Build: Successfully executed ./gradlew :app:assemble.
Runtime: Verified that object declarations are initialized only on first access and that companion objects can be accessed directly via the class name in Kotlin.

See the Step-by-Step Explanation for technical details.

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