20+ Tredence Software Engineer Interview Questions and Answers

Validate if a given string is a palindrome after removing special characters, spaces, and converting to lowercase.

• Remove special characters and spaces from the input string

• Convert the string to lowercase

• Check if the modified string is equal to its reverse to determine if it's a palindrome

Given an array and a target sum, find pairs of elements that add up to the target sum.

• Iterate through the array and for each element, check if the complement (target sum - current element) is present in a hash set.

• If the complement is found, add the pair to the result list.

• Sort the pairs based on the first element, and if the first elements are equal, sort based on the second element.

Reverse a singly linked list of integers and return the head of the reversed linked list.

• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list as the last node encountered during the reversal process.

Find the first repeated character in a given string of lowercase English letters.

• Iterate through the string and keep track of characters seen so far

• Return the first character that repeats, if none, return '%'

• Use a hash set or array to store characters seen

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 takes one integer followed by a variable number of integers ...read more

I followed a systematic process to debug CSS code and resolve functionality issues.

• Reviewed the CSS code to identify any syntax errors or typos

• Checked for any conflicting styles that may be overriding the desired functionality

• Used browser developer tools to inspect elements and troubleshoot layout issues

• Tested different scenarios to pinpoint the exact cause of the problem

• Made necessary adjustments to the CSS code to fix the functionality

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.

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, etc.

• In Spring MVC, the DispatcherServlet acts as the fro...read more

A puzzle involving 4 liters of water where you need to measure specific quantities using only a 3-liter and a 5-liter jug.

• You have two jugs - one holds 3 liters and the other holds 5 liters.

• The goal is to measure out exactly 4 liters of water using only these two jugs.

• You can fill the jugs, empty them, and transfer water between them to achieve the desired quantity.

You can change the background color of all items in JavaScript by selecting all elements and setting their background color property.

• Select all elements using document.querySelectorAll()

• Loop through the selected elements and set their style.backgroundColor property

• Example: document.querySelectorAll('.item').forEach(item => item.style.backgroundColor = 'blue');

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.

The annotation for request mapping in Java is @RequestMapping.

• @RequestMapping annotation is used to map web requests to specific handler methods in Spring MVC.

• It can be applied at class level or method level to specify the URL path that the controller will handle.

• You can also specify HTTP request methods, headers, parameters, and more using @RequestMapping.

The annotation used for a controller in Java is @RestController.

• Used to define a class as a controller in Spring MVC

• Automatically serializes return objects into JSON/XML responses

• Equivalent to @Controller + @ResponseBody annotations

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, [ApiController] in ASP.NET MVC

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

To select all div elements using jQuery, use the selector $('div').

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

• You can also use the find() method to select div elements within a specific parent element.

• To perform actions on the selected div elements, use jQuery methods like css(), text(), or addClass().

The final keyword in Java is used to define constants, prevent method overriding, and make a class immutable.

• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be extended

Front Controller in Spring MVC is a design pattern that handles all requests and acts as a central point of control.

• Front Controller is a servlet in Spring MVC that receives all requests and then dispatches them to the appropriate handlers.

• It helps in centralizing request handling logic, improving code organization and reducing duplication.

• Front Controller can perform tasks like authentication, logging, exception handling, and more before passing the request to the actual han...read more

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.

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 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 request parameters or headers

• Example: @RequestMapping(value = ...read more

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 CSS box model is a design and layout concept that defines the structure and sizing of elements on a web page.

• It consists of content, padding, border, and margin around an element.

• Content area is where text and images are displayed.

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

• Border is the line that goes around the padding and content.

• Margin is the space outside the border.

• Example: div { width: 200px; padding: 20px; border: 1px solid black; margin: 10px; }

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 and height of an element are calculated by adding the conten...read more