🛠️ Design Patterns

MENU

Quiz 2

6 min read

All the Question are based on the pattern Singleton Pattern, Command Pattern, Adapter Pattern, Facade Pattern, Iterator Pattern, Composite Pattern, State Pattern, Proxy Pattern & Compound Pattern.

Question 1

You are building an expense dashboard app (like your CashFlow project).
The application needs one shared database connection so that:

  • All modules use the same connection
  • Creating multiple connections would waste memory and slow the system

Which design pattern is most appropriate here, and why?

Question 2

You are designing a remote control app for smart home devices.
Each button can:

  • Turn lights ON/OFF
  • Open/close curtains
  • Start the fan

You also want to support Undo functionality. Which design pattern is most appropriate here, and why?

Question 3

You are integrating a payment gateway into an e-commerce system.
Your system expects a standard payment interface, but the new gateway provides a different API that cannot be changed.

Which design pattern is most appropriate here, and why?

Question 4

You are building a movie streaming app.
Playing a movie involves:

  • Authentication
  • Loading subtitles
  • Initializing decoder
  • Buffering video

You want a simple method like: playMovie()

Which design pattern is most appropriate here, and why?

Question 5

You are developing a music playlist app.
Users should move through songs without knowing whether songs are stored in arrays, lists, or databases.

Which design pattern is most appropriate here, and why?

Question 6

You are building a file explorer system where:

  • A folder can contain files and other folders
  • Operations like delete() or showSize() should work uniformly

Which design pattern is most appropriate here, and why?

Question 7

You are designing a document editor where documents can be:

  • Draft
  • Review
  • Published
    Each state changes editing behavior.

Which design pattern is most appropriate here, and why?

Question 8

You are developing an image viewer where large images should load only when opened, while placeholders are shown initially.

Which design pattern is most appropriate here, and why?

Question 9

You are integrating a complex third-party payment library and create a simple class exposing only a few methods like startPayment() and verifyPayment().

Which design pattern is most appropriate here, and why?

Question 10

You are building a text editor that supports:

  • Copy
  • Paste
  • Cut
  • Undo / Redo
    Operations must be stored and reversible.

Which design pattern is most appropriate here, and why?

Question 11

You are designing a company organizational hierarchy where:

  • Managers contain employees
  • Employees and managers should be treated uniformly

Which design pattern is most appropriate here, and why?

Question 12

A banking system performs authentication and validation before forwarding requests to the real transfer service.

Which design pattern is most appropriate here, and why?

Question 13

You are designing a vending machine where behavior changes depending on:

  • Coin inserted
  • Item selected
  • Item dispensed

Which design pattern is most appropriate here, and why?

Question 14

Your application expects a logging interface, but a legacy logging system has a different method signature.

Which design pattern is most appropriate here, and why?

Question 15

You are building a graphics editor where:

  • Shapes can be individual or grouped
  • Calling draw() should work for both

Which design pattern is most appropriate here, and why?

Question 16

A library management system stores books in multiple structures but must allow uniform traversal.

Which design pattern is most appropriate here, and why?

Question 17

You are designing a configuration manager that must:

  • Load configuration once
  • Share it globally

Which design pattern is most appropriate here, and why?

Question 18

A video streaming platform uses a local cache server that decides whether to fetch from cache or the main server.

Which design pattern is most appropriate here, and why?

Question 19

A smart home system combines:

  • Command for actions
  • Composite for device groups
  • Iterator for traversal
  • Facade for simplified control

What is this approach called?

Question 20

A game character system has states like:

  • Standing
  • Running
  • Jumping
  • Attacking
    Behavior changes dynamically with state.

Which design pattern is most appropriate here, and why?

Recent Patterns

Backlinks