Design Patterns in Software Engineering

What is the main goal of using design patterns in software engineering?

• Replace comments

• Solve specific bugs

• Increase CPU speed

• Reuse solutions to common design problems

Which of the following is NOT one of the four essential parts of a design pattern?

• Pattern name

• The problem

• Solution

• Programming syntax

What type of design pattern focuses on object creation?

• Structural

• Behavioral

• Creational

• Relational

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

• Factory

• Builder

• Singleton

• Strategy

What is the main idea behind the Factory Method pattern?

• Build objects using inheritance

• Hide object creation logic

• Define one universal object

• Return multiple unrelated objects

The Abstract Factory pattern is used to:

• Create one type of object

• Link unrelated classes

• Create families of related objects

• Track runtime behavior

What does the Builder pattern focus on?

• Running commands

• Building complex objects step by step

• Wrapping objects

• Checking object types

Which pattern lets you change an object’s behavior by switching out algorithms?

• Adapter

• Command

• Strategy

• Decorator

The Command pattern is used to:

• Hide object creation

• Allow command history and undo

• Return different subclasses

• Secure object access

What is the main use of the Decorator pattern?

• Track function calls

• Replace constructors

• Add responsibilities at runtime

• Combine two interfaces