Infosys Technical Analyst Interview Questions and Answers

OOP concepts include encapsulation, inheritance, polymorphism, and abstraction, forming the foundation of object-oriented programming.

• Encapsulation: Bundling data and methods in a class. Example: A 'Car' class with properties like 'speed' and methods like 'accelerate()'.

• Inheritance: Deriving new classes from existing ones. Example: 'ElectricCar' inherits from 'Car', adding features like 'batteryCapacity'.

• Polymorph...read more

Data warehouse (DWH) is structured and optimized for querying and analysis, while data lake is a vast repository for storing raw data in its native format.

• DWH is used for structured data and is optimized for querying and analysis.

• Data lake stores raw data in its native format, allowing for more flexibility and scalability.

• DWH is typically used for business intelligence and reporting purposes.

• Data lake is suitable ...read more

Hive tables store data in HDFS while external tables reference data stored outside HDFS.

• Hive tables store data in HDFS, while external tables reference data stored outside HDFS.

• External tables are useful when data needs to be shared across different Hive instances or when data is already stored in a different location.

• Hive tables are managed by Hive and are deleted when the table is dropped, while external tables ...read more

The default keyword is used in programming languages to specify a default value or behavior.

• In switch statements, default is used as a catch-all case when no other case matches

• In function parameters, default values can be specified using the default keyword

• In object destructuring, default values can be assigned using the default keyword

String pool is a mechanism in programming languages where strings are stored in a shared memory area to save memory and improve performance.

• String pool helps in reducing memory usage by storing only one copy of each unique string.

• Strings in the pool can be easily shared among different parts of the program.

• In Java, string literals are automatically stored in the string pool.

• Example: String str1 = "Hello"; String s...read more

A simple thread program demonstrates basic multithreading in Java using the Thread class.

• Create a class that extends Thread.

• Override the run() method to define the thread's task.

• Instantiate the thread class and call start() to execute.

• Example: public class MyThread extends Thread { public void run() { System.out.println('Thread running'); } }