Leaf (File):?

Short answer: The File class represents the leaf in the tree structure. It is an individual component (a file) and implements the ShowInfo() method to display its details. public class File : IFileSystemComponent

Example code

{
private string _name;
public File(string name) => _name = name;
public void ShowInfo() => Console.WriteLine($"File: {_name}");
}

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.