Royal Deep Construction Interview Questions and Answers

Abstract class allows partial implementation while interface allows full abstraction.

• Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract class is used when some common functionality needs to be shared among subclasses, while interface is used to define a contract for classes to implement.

• Example: Abstract class 'Shape' with abst...read more

TDD stands for Test-Driven Development and BDD stands for Behavior-Driven Development. TDD focuses on writing tests before writing code, while BDD focuses on the behavior of the system.

• TDD involves writing a failing test, writing code to make the test pass, and then refactoring the code.

• BDD focuses on defining the behavior of the system through examples written in a specific format like Given-When-Then.

• TDD is more developer-centric, while BDD involves collaboration between de...read more

I have extensive experience in designing and implementing frameworks for various software projects.

• Designed and implemented a custom testing framework for automated testing of web applications.

• Utilized Spring framework for developing enterprise applications, including dependency injection and aspect-oriented programming.

• Contributed to the design and implementation of a microservices architecture using Netflix OSS frameworks like Eureka and Zuul.

Program to find frequency of words in a sentence

• Split the sentence into words using space as delimiter

• Create a map to store word frequencies

• Iterate through the words and update the map accordingly

• Handle case sensitivity and punctuation if needed

Program to check if sum of digits of a number is prime

• Convert the number to a string to iterate through each digit

• Calculate the sum of digits

• Check if the sum is a prime number

SQL query to get the second highest salary in a table

• Use the MAX() function to find the highest salary

• Use the WHERE clause to exclude the highest salary

• Order the salaries in descending order and limit the result to 1

Objects are stored in memory in the heap or stack depending on their scope and lifetime.

• Objects with local scope are stored on the stack, while objects with dynamic memory allocation are stored on the heap.

• Primitive data types like int, float are stored on the stack, while complex objects like arrays, classes are stored on the heap.

• Objects stored on the stack have faster access but limited size, while objects on the heap have slower access but can grow dynamically.

var, let, and const are all used for variable declaration in JavaScript, but they have different scopes and mutability.

• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared