Master the Gang of Four (GoF) design patterns: Creational, Structural, and Behavioral.

Building maintainable software requires proven solutions. This quiz covers key patterns like Singleton, Factory, Observer, Strategy, Adapter, Decorator, and Command. Understand when to use them and how to identify them in code.

What are the three main categories of Design Patterns?

Which pattern ensures a class has only one instance and provides a global point of access to it?

Which pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable?

Which pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified?

Which pattern converts the interface of a class into another interface clients expect?

Which pattern attaches additional responsibilities to an object dynamically without subclassing?

Which pattern provides a unified interface to a set of interfaces in a subsystem?

Which pattern encapsulates a request as an object, thereby letting you parameterize clients with different requests?

Which pattern defines the skeleton of an algorithm in an operation, deferring some steps to subclasses?

Which pattern separates the construction of a complex object from its representation?

Which pattern is used to access the elements of an aggregate object sequentially without exposing its underlying representation?

Which pattern allows an object to alter its behavior when its internal state changes?

Which pattern provides a surrogate or placeholder for another object to control access to it?

Which pattern composes objects into tree structures to represent part-whole hierarchies?

Which pattern uses sharing to support large numbers of fine-grained objects efficiently?

Which pattern captures and externalizes an object's internal state so that separate object can restore the object to this state later?

Which pattern defines an object that encapsulates how a set of objects interact?

Which pattern avoids coupling the sender of a request to its receiver by giving more than one object a chance to handle the request?

Which pattern specifies the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype?

Which pattern represents an operation to be performed on the elements of an object structure?

Which pattern decouples an abstraction from its implementation so that the two can vary independently?

Which pattern is often used to implement 'Undo' functionality?

MVC (Model-View-Controller) is strictly a GoF pattern?

What is dependency injection mainly related to?

When should you use the Singleton pattern?

Which pattern involves a 'Director' class?

In Strategy pattern, who chooses the strategy?

Which pattern is also known as 'Wrapper'?

Which pattern provides a way to access the elements of a container object?

Which pattern allows defining a grammar for a language?

In Observer pattern, the object being observed is called?

Which pattern limits the number of instances of a class?

What is 'Double-Checked Locking' used for?

Adapter pattern vs Decorator: Adapter provides?

Which pattern is used in Java's InputStream/FilterInputStream?

Which pattern is used in Java's GUI event listeners?

What type of pattern is 'Factory Method'?

React's Higher Order Components (HOC) are similar to which pattern?

Dependency Inversion Principle (DIP) suggests dependency on?

Which pattern is best for implementing a 'Wizard' or multi-step form?

Design Patterns (GoF)

What You'll Learn

Topics Covered

Quiz Details

Ready to Test Your Skills?