Enquero Data Engineer Interview Questions and Answers

An annotation for controller in software engineering.

• The annotation for controller is used to define the class as a controller in a software application.

• It is typically used in frameworks like Spring MVC or ASP.NET MVC.

• The annotation helps in mapping the incoming requests to the appropriate controller methods.

• It can also be used to specify the URL path for the controller.

• Example: @Controller in Spring MVC, [ApiControll

The annotation for request mapping is used to map HTTP requests to specific methods in a controller class.

• The annotation is @RequestMapping

• It can be used at the class level to specify a common base URL for all methods in the class

• It can also be used at the method level to specify the URL path and HTTP method for a specific method

• Additional attributes can be used to further customize the mapping, such as specifying requ...read more

Front controller is a design pattern used in Spring MVC to handle incoming requests and route them to appropriate handlers.

• Front controller acts as a central point of control for handling requests in Spring MVC.

• It receives all incoming requests and delegates them to appropriate handlers called controllers.

• Front controller provides a consistent way to handle requests and perform common tasks like authentication, logging...read more

The CSS box model describes the layout and sizing of elements on a web page.

• The box model consists of content, padding, border, and margin.

• Content refers to the actual content of the element, such as text or images.

• Padding is the space between the content and the border.

• Border is a line that surrounds the padding and content.

• Margin is the space outside the border, separating the element from other elements.

• The width an...read more

Select all div using jQuery

• Use the jQuery selector $('div') to select all div elements

• This will return a jQuery object containing all the selected div elements

• You can then perform operations on the selected div elements using jQuery methods

Use jQuery to change the background color of all ul elements to blue.

• Use the jQuery selector to select all ul elements

• Use the css() method to change the background color to blue

Use jQuery to change the background color of the first li element to yellow.

• Use the :first-child selector to select the first li element

• Use the css() method to change the background color to yellow

The output of the given code is [1, 2, 3, 4, 5, 6].

• The 'push' method adds an element to the end of the array.

• The 'unshift' method adds an element to the beginning of the array.

• The 'pop' method removes the last element from the array.

• The 'shift' method removes the first element from the array.

The 'final' keyword in Java is used to declare constants, prevent method overriding, and ensure thread safety.

• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden by subclasses

• Final classes cannot be extended by other classes

• Final parameters ensure that they cannot be modified within a method

• Final fields can be used to achieve thread safety

The question is about method overloading in Java.

• Method overloading allows multiple methods with the same name but different parameters.

• The method to be called is determined at compile-time based on the arguments passed.

• In the given code, there are three overloaded methods with the same name 'getsum'.

• The first method takes two integers as arguments.

• The second method takes three integers as arguments.

• The third method ta...read more

The program will result in a StackOverflowError due to infinite recursion.

• The 'floating' method is recursively calling itself without a base case to stop the recursion.

• Each recursive call multiplies the input parameter by the result of the recursive call with a decremented parameter.

• This will continue indefinitely until the stack overflows and an error is thrown.

The output of the code is 9.

• The code initializes i as 0 and j as 10.

• Inside the do-while loop, i is incremented by 1 and j is decremented by 1.

• The loop continues until i becomes greater than or equal to j.

• Since i is incremented before the comparison and j is decremented before the comparison, the loop runs 9 times.

• Therefore, the output is 9.