Gyansys Infotech Interview Questions and Answers

Final keyword restricts modification while static keyword is used for class-level variables and methods.

• Final keyword is used to make a variable constant and cannot be modified once initialized.

• Final keyword can also be used to make a method un-overridable in a subclass.

• Static keyword is used to declare class-level variables and methods.

• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

I am proficient in C and Java programming languages.

• Experience in developing applications using C and Java

• Knowledge of data structures and algorithms

• Familiarity with object-oriented programming concepts

• Ability to write efficient and optimized code

• Examples: Developed a Java-based web application for online shopping, Implemented a C program for sorting algorithms

Boxing is the process of converting a value type to a reference type, while unboxing is the opposite process.

• Boxing is done implicitly by the compiler when a value type is assigned to a reference type variable.

• Unboxing requires an explicit cast from the reference type back to the original value type.

• Boxing and unboxing can impact performance, so they should be used carefully in performance-critical code.

Sessions in MVC are used to store and manage user-specific data throughout multiple requests.

• Sessions are used to maintain state between multiple requests from the same user.

• Data stored in sessions is unique to each user and can be accessed across different pages.

• Sessions can be used to store user authentication information, shopping cart items, etc.

• Sessions can be managed using session variables in MVC controllers.

Repartition and coalesce are used to manage the number of partitions in a Spark RDD. DAG and lineage are concepts related to Spark's execution model.

• Repartition increases the number of partitions by shuffling data across the network, while coalesce reduces the number of partitions by merging them together.

• DAG (Directed Acyclic Graph) is a graph of stages in a Spark job, while lineage is the record of transformations that were applied to the data to produce the current RDD.

• Und...read more