Computer Knowledge

Java Enterprise and Web Technologies

2,183 Questions

Java enterprise and web technologies questions focus on J2EE architecture, web services like SOAP, and servlet functionalities. These topics frequently appear in IT officer and specialist scale examinations. Regular practice ensures familiarity with enterprise application components.

HttpServlet methodsSOAP and web servicesEJB architecture rolesJ2EE componentsJSP servlet callingUDDI concepts

Java Enterprise and Web Technologies Questions

Multiple choice

What is the concept of dependency injection in Angular?

  1. A technique for providing dependencies to components and services

  2. A way to create custom HTML elements

  3. A method for handling user input and events

  4. A mechanism for performing HTTP requests
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dependency injection in Angular is a technique for providing dependencies to components and services. It allows for a more modular and testable codebase, as dependencies can be easily swapped out or replaced.

Multiple choice

Which design pattern is implemented by Angular's Dependency Injection (DI) mechanism?

  1. Singleton

  2. Factory

  3. Decorator

  4. Observer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Angular's DI utilizes the Decorator design pattern to inject dependencies into components, services, and other Angular classes.

Multiple choice

What is the purpose of the @Inject() decorator in Angular?

  1. To specify the dependencies required by a service

  2. To define the scope of a service (root or component)

  3. To provide metadata about a service for DI

  4. To configure the lifecycle hooks of a service
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The @Inject() decorator in Angular allows you to specify the dependencies required by a service, enabling DI and the automatic instantiation of those dependencies.

Multiple choice

Which Angular service is responsible for making HTTP requests?

  1. HttpClient

  2. HttpService

  3. HttpRequest

  4. HttpResponse
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The HttpClient service in Angular is used for making HTTP requests and handling HTTP responses, providing a convenient way to communicate with RESTful APIs.

Multiple choice

Which Angular service is used for managing user authentication and authorization?

  1. AuthService

  2. UserService

  3. SecurityService

  4. JwtService
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

AuthService is a common name for a service in Angular that handles user authentication and authorization, providing methods for login, logout, and managing user roles and permissions.

Multiple choice

How can you specify the HTTP method for a fetch() request?

  1. Using the method option

  2. Using the type option

  3. Using the request option

  4. Using the data option
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The method option in the fetch() method allows you to specify the HTTP method to use for the request.

Multiple choice

What is the purpose of the headers option in the fetch() method?

  1. To specify the request headers

  2. To specify the response headers

  3. To specify the request body

  4. To specify the response body
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The headers option in the fetch() method allows you to specify the request headers to send with the request.

Multiple choice

What is the purpose of the readystatechange event in XMLHttpRequest?

  1. To notify when the request state changes

  2. To notify when the response is received

  3. To notify when the request is completed

  4. To notify when an error occurs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The readystatechange event in XMLHttpRequest is used to notify when the state of the request changes.