10+ Holbrook Infra & Power Interview Questions and Answers

Static binding is resolved at compile time while dynamic binding is resolved at runtime in Java.

• Static binding is also known as early binding.

• Dynamic binding is also known as late binding.

• Example of static binding: method overloading.

• Example of dynamic binding: method overriding.

Airport Management System schema and ER diagram design

• Entities: Airport, Flight, Passenger, Employee, Schedule

• Attributes: Airport (code, name, location), Flight (number, destination, departure time), Passenger (name, age, contact info), Employee (ID, name, role), Schedule (flight number, date, time)

• Relationships: Airport has many Flights, Flight has many Passengers, Employee works at Airport, Flight has Schedule

Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.

• Identify the functional dependencies in the table

• Eliminate partial dependencies by breaking the table into multiple tables

• Eliminate transitive dependencies by further breaking down the tables

• Ensure each table has a primary key and all non-key attributes are fully functionally dependent on the primary key

PUT is used to update or replace an existing resource, while POST is used to create a new resource.

• PUT is idempotent, meaning multiple identical requests will have the same effect as a single request

• POST is not idempotent, meaning multiple identical requests may have different effects

• PUT is used to update an existing resource at a specific URI

• POST is used to create a new resource under a specific URI

• Example: PUT /users/123 updates user with ID 123, POST /users creates a new u...read more

JAR files are Java Archive files that store multiple Java class files and related metadata.

• JAR files are used to package Java classes, resources, and metadata into a single file.

• They are commonly used for distributing Java libraries or applications.

• JAR files can be created using the 'jar' command in Java.

• They can also be executed using the 'java -jar' command.

• Example: mylibrary.jar contains all the class files and resources needed for a Java library.

wait() and signal() are functions used for synchronization in multithreading.

• wait() is used to make a thread wait until a certain condition is met

• signal() is used to wake up a waiting thread when the condition is met

• Example: Producer-consumer problem where producer signals consumer to consume when a new item is produced

REST is an architectural style for designing networked applications

• REST stands for Representational State Transfer

• It uses standard HTTP methods like GET, POST, PUT, DELETE

• Resources are identified by URIs

• Data is transferred in JSON or XML format

• Example: GET request to 'https://api.example.com/users' to retrieve a list of users

A Singleton class is a class that can only have one instance created at a time.

• Singleton classes are often used for managing resources that should only have one instance, such as a database connection.

• To implement a Singleton class, you typically make the constructor private and provide a static method to access the single instance.

• Example: Singleton class for logging system where only one instance of the logger is needed.

CAP Theorem states that in a distributed system, it is impossible to simultaneously guarantee consistency, availability, and partition tolerance.

• Consistency: All nodes in the system have the same data at the same time.

• Availability: Every request gets a response, even if some nodes are down.

• Partition Tolerance: The system continues to operate despite network partitions.

• Trade-offs: In a distributed system, you can only have two out of the three - Consistency, Availability, and ...read more