Indian Railways Technical Analyst Interview Questions and Answers

HANA is an in-memory database and application development platform developed by SAP.

• HANA stands for High-Performance Analytic Appliance.

• It allows real-time processing of large amounts of data.

• It can be used for data warehousing, analytics, and application development.

• HANA is used by businesses to gain insights from their data and make better decisions.

• Examples of companies using HANA include Coca-Cola, Nestle, and Merc

Answers to questions related to Docker, AWS firewall types, and ELK Stack

• To create a Docker file, start with a base image and add necessary dependencies and configurations

• AWS has two types of firewalls: Network ACLs and Security Groups

• ELK Stack is a combination of Elasticsearch, Logstash, and Kibana used for log management and analysis

String is immutable because it cannot be modified once created.

• Immutable objects are safer to use in multi-threaded environments.

• String pool in Java is possible because of immutability.

• StringBuffer and StringBuilder classes are used for mutable strings.

• Example: String s = "hello"; s.concat(" world"); // returns a new string, s remains unchanged.

Thread communication refers to the exchange of data between threads in a multi-threaded program.

• Threads can communicate through shared memory or message passing.

• Shared memory involves multiple threads accessing the same memory location.

• Message passing involves threads sending and receiving messages to/from a message queue.

• Synchronization mechanisms like locks and semaphores are used to ensure thread safety.

• Examples of ...read more

Exception handling is an important aspect of any project to ensure smooth functioning.

• We use try-catch blocks to handle exceptions.

• We log the exceptions to track and fix them.

• We also use custom exceptions to handle specific errors.

• We prioritize handling critical exceptions first.

• We regularly review and update our exception handling approach.

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract methods that must be implemented by its subclasses.

• Abstract classes can have non-abstract methods and fields.

• An abstract class can be used to define a common interface for a group of related classes.

• Example: Animal is an abstract class and Dog, Cat, and Bird are its subclasses.

• Examp...read more