Building web user interfaces

Question 1

What is the primary purpose of the Vaadin framework in the context of the weather application?

a) To manage database connections
b) To build simple and functional user interfaces using Java
c) To handle HTTP requests
d) To define RESTful endpoints

Answer 1

b) To build simple and functional user interfaces using Java

Question 2

What is the purpose of the @Route annotation in Vaadin?

a) To define a class as a RESTful controller
b) To specify the base service name for a RESTful controller
c) To map a class to a web page at a specific URL
d) To define a GET endpoint

Answer 2

c) To map a class to a web page at a specific URL

Question 3

What is the purpose of the VerticalLayout class in Vaadin?

a) To define a class as a RESTful controller
b) To arrange components vertically on a web page
c) To manage database connections
d) To handle HTTP requests

Answer 3

b) To arrange components vertically on a web page

Question 4

What is the purpose of the HorizontalLayout class in Vaadin?

a) To define a class as a RESTful controller
b) To arrange components horizontally on a web page
c) To manage database connections
d) To handle HTTP requests

Answer 4

b) To arrange components horizontally on a web page

Question 5

What is the purpose of the Button component in Vaadin?

a) To display text
b) To create clickable buttons that trigger actions
c) To manage database connections
d) To handle HTTP requests

Answer 5

b) To create clickable buttons that trigger actions

Question 6

What is the purpose of the TextField component in Vaadin?

a) To display text
b) To create input fields for text data
c) To manage database connections
d) To handle HTTP requests

Answer 6

b) To create input fields for text data

Question 7

What is the purpose of the RadioButtonGroup component in Vaadin?

a) To display text
b) To create a group of radio buttons for selecting options
c) To manage database connections
d) To handle HTTP requests

Answer 7

b) To create a group of radio buttons for selecting options

Question 8

What is the purpose of the Grid component in Vaadin?

a) To display text
b) To create a table for displaying tabular data
c) To manage database connections
d) To handle HTTP requests

Answer 8

b) To create a table for displaying tabular data

Question 9

What is the purpose of the Image component in Vaadin?

a) To display text
b) To display images on a web page
c) To manage database connections
d) To handle HTTP requests

Answer 9

b) To display images on a web page

Question 10

What is the purpose of the refreshData method in the WeatherMainView class?

a) To define the structure of the database table
b) To retrieve the latest weather data and update the UI
c) To manage database connections
d) To handle HTTP requests

Answer 10

b) To retrieve the latest weather data and update the UI

Question 11

What is the purpose of the computeFahrenheit method in the WeatherMainView class?

a) To convert temperature from Celsius to Fahrenheit
b) To convert temperature from Fahrenheit to Celsius
c) To manage database connections
d) To handle HTTP requests

Answer 11

a) To convert temperature from Celsius to Fahrenheit

Question 12

What is the purpose of the computeMiles method in the WeatherMainView class?

a) To convert distance from kilometers to miles
b) To convert distance from miles to kilometers
c) To manage database connections
d) To handle HTTP requests

Answer 12

a) To convert distance from kilometers to miles

Question 13

What is the purpose of the computeFeet method in the WeatherMainView class?

a) To convert distance from meters to feet
b) To convert distance from feet to meters
c) To manage database connections
d) To handle HTTP requests

Answer 13

a) To convert distance from meters to feet

Question 14

What is the purpose of the computeInches method in the WeatherMainView class?

a) To convert precipitation from millimeters to inches
b) To convert precipitation from inches to millimeters
c) To manage database connections
d) To handle HTTP requests

Answer 14

a) To convert precipitation from millimeters to inches

Question 15

What is the purpose of the convertWindDirection method in the WeatherMainView class?

a) To convert wind direction from degrees to a compass direction
b) To convert wind direction from a compass direction to degrees
c) To manage database connections
d) To handle HTTP requests

Answer 15

a) To convert wind direction from degrees to a compass direction

Question 16

What is the purpose of the buildControls method in the WeatherMainView class?

a) To define the structure of the database table
b) To build the controls for the UI, including the Refresh button
c) To manage database connections
d) To handle HTTP requests

Answer 16

b) To build the controls for the UI

Question 17

What is the purpose of the buildUnitRadio method in the WeatherMainView class?

a) To define the structure of the database table
b) To build the unit selection radio buttons for the UI
c) To manage database connections
d) To handle HTTP requests

Answer 17

b) To build the unit selection radio buttons for the UI

Question 18

What is the purpose of the buildStationDataView method in the WeatherMainView class?

a) To define the structure of the database table
b) To build the station data view for the UI
c) To manage database connections
d) To handle HTTP requests

Answer 18

b) To build the station data view for the UI

Question 19

What is the purpose of the buildTempPrecipView method in the WeatherMainView class?

a) To define the structure of the database table
b) To build the temperature and precipitation view for the UI
c) To manage database connections
d) To handle HTTP requests

Answer 19

b) To build the temperature and precipitation view for the UI

Question 20

What is the purpose of the buildCloudVisibilityView method in the WeatherMainView class?

a) To define the structure of the database table
b) To build the cloud and visibility view for the UI
c) To manage database connections
d) To handle HTTP requests

Answer 20

b) To build the cloud and visibility view for the UI