10+ Say Bolt Inspection Service Interview Questions and Answers

Answering technical questions on Spring XML configuration, bean scopes, Agile method, prime numbers, and hashmap.

• To read property file from Spring XML configuration, use tag

• Bean scopes in Spring are singleton, prototype, request, session, and global-session

• Agile method is an iterative approach to software development

• Prime numbers are numbers that are only divisible by 1 and itself

• Internal working of hashmap involves hashing the key to get an index and storing the value at th...read more

Java 8 features include lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods allow interfaces to have method implementations.

• Examples: Using lambda expressions to iterate over a list, using streams to filter and map data.

Docker is a containerization platform that allows developers to package and deploy applications in a portable manner. Kubernetes is an orchestration tool that automates the deployment, scaling, and management of containerized applications.

• Docker allows developers to create lightweight, portable containers that can run on any machine with Docker installed.

• Kubernetes provides a way to manage and orchestrate these containers, allowing for easy scaling and management of applicati...read more

Switch-case can break the Open/Closed Principle by requiring modification of existing code for new cases.

• Switch-case statements violate the Open/Closed Principle, which states that classes should be open for extension but closed for modification.

• Adding a new case to a switch statement requires modifying the existing code, violating the principle of not modifying existing code.

• Instead of using switch-case, consider using polymorphism or the Strategy pattern to achieve the same...read more

Use stream API to find sum of even numbers from a list

• Use filter to get only even numbers

• Use mapToInt to convert stream to IntStream

• Use sum() to get the sum of even numbers

API is a set of protocols and tools for building software applications. Frameworks are pre-built libraries of code for easier development in Python.

• API stands for Application Programming Interface

• APIs allow different software applications to communicate with each other

• Python has many popular APIs such as Flask, Django, and FastAPI

• Frameworks are pre-built libraries of code that provide a structure for developing applications

• Python has many popular frameworks such as Flask, Dja...read more

Liskov's substitution principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.

• Subtypes must be substitutable for their base types

• Derived classes should be able to extend the functionality of base classes without changing their behavior

• Violating this principle can lead to unexpected behavior and errors in the program

Authentication in API requests is the process of verifying the identity of the user or application making the request.

• Authentication ensures that only authorized users or applications can access the API resources.

• API requests are authenticated using tokens, API keys, or other credentials.

• Authentication can be implemented using various protocols such as OAuth, JWT, or Basic Authentication.

• Authentication is important for security and protecting sensitive data.

Python has several built-in datatypes including numeric, sequence, and mapping types.

• Numeric types include integers, floats, and complex numbers.

• Sequence types include lists, tuples, and range objects.

• Mapping types include dictionaries.

• Other datatypes include boolean, bytes, and sets.

JWT is a token-based authentication mechanism while OAuth is an authorization framework.

• JWT stands for JSON Web Token and is used for securely transmitting information between parties as a JSON object.

• OAuth is an authorization protocol that allows third-party applications to access user data without sharing passwords.

• JWT is often used in combination with OAuth for authentication purposes.

• OAuth has different versions such as OAuth 1.0a, OAuth 2.0, etc.

• Examples of companies usi...read more

Generator is a function that returns an iterator. Decorator is a function that takes another function and extends its behavior.

• Generator functions use the yield keyword to return values one at a time.

• Decorators are used to modify the behavior of a function without changing its source code.

• Decorators can be stacked on top of each other to create complex behavior.

• Example of generator: function* myGenerator() { yield 1; yield 2; yield 3; }

• Example of decorator: @myDecorator funct...read more

Map applies a function to each element in a collection, while flatMap applies a function that returns a collection and flattens the result. Function is used to transform input into output, Predicate is used to test a condition.

• Map transforms each element in a collection using a function

• FlatMap transforms each element in a collection using a function that returns a collection and flattens the result

• Function is used to transform input into output

• Predicate is used to test a cond...read more

Promise is a one-time operation that resolves or rejects, while Observable is a stream of multiple values over time.

• Promise is eager, Observable is lazy

• Promise can only handle a single value, Observable can handle multiple values

• Promise is not cancellable, Observable can be unsubscribed

• Promise is not composable, Observable is composable

• Example: Promise resolves with a single value like fetching data from an API, Observable streams multiple values like user input events

Pure popes are those who have never been married, while impure popes are those who were previously married.

• Pure popes have never been married, following the tradition of celibacy in the Catholic Church.

• Impure popes were previously married before becoming pope, which is rare but has happened in history.

• Examples of impure popes include Pope Adrian II and Pope Clement IV.

Test cases for ATM

• Verify if the ATM is dispensing the correct amount of cash

• Check if the ATM is accepting valid cards and rejecting invalid ones

• Test if the ATM is able to handle multiple transactions in a row

• Ensure that the ATM is properly secured and user data is protected