Free Ultimate Design Pattern Question and Answers

Question 1

In a communication diagram, the sequence number is always followed immediately by a(n) _______.

Accepted Answer

Colon

Answer

In a communication diagram (formerly collaboration diagram), the sequence number indicates the order of messages in an interaction. A colon always immediately follows the sequence number to separate it from the message name and arguments, for example, '1: messageName()'.

Question 2

Which of the following pertains to a view layer class's duties?

Accepted Answer

Display electronic forms and reports

Answer

The view layer, also known as the presentation layer, is responsible for all aspects of user interaction. Its primary duties include displaying electronic forms, reports, and other visual elements to the user, as well as capturing user input. It acts as the interface between the user and the application's underlying logic.

Question 3

Which of the following is a domain layer class's duty?

Accepted Answer

Process all business rules with appropriate logic

Answer

The domain layer, or business logic layer, is where the core business rules and logic of an application reside. Its primary duty is to process all business rules with appropriate logic, ensuring that the application behaves correctly according to the defined requirements. It encapsulates the 'what' and 'how' of the business operations.

Question 4

Which of the following pertains to a data access layer class's duties?

Accepted Answer

Disconnect gracefully from the database

Answer

The data access layer is responsible for interacting with the persistent storage, typically a database. Its duties include establishing and maintaining connections to the database, performing CRUD (Create, Read, Update, Delete) operations, and gracefully disconnecting from the database to manage resources efficiently.

Question 5

Retrieve and update attribute values using ___ methods.

Accepted Answer

Get and set

Answer

In object-oriented programming, 'get' (accessor) methods are used to retrieve the value of an attribute, while 'set' (mutator) methods are used to update its value. These methods provide controlled access to an object's internal state, adhering to the principle of encapsulation.

Pattern Design Practice Test

Pattern Design Practice Test

Free Ultimate Design Pattern Question and Answers