My Engineering Buddy Interview Questions and Answers

I use boto3 library to automate tasks in aws.

• Boto3 is the Amazon Web Services (AWS) Software Development Kit (SDK) for Python.

• It allows Python developers to write software that makes use of services like Amazon S3 and Amazon EC2.

• Boto3 makes it easy to integrate your Python application, library, or script with AWS services.

• Example: boto3.client('s3') to create a client for Amazon S3 service.

Global keyword is used to define a variable as global, which can be accessed from any part of the program.

• Global keyword is used to declare a variable outside of a function, making it accessible from any part of the program.

• It is useful when a variable needs to be accessed by multiple functions or modules.

• Global variables can be modified by any function that has access to them, which can lead to unexpected behavior.

• Example: global x def func(): global x x = 10 func() print(x)...read more

Java 8 features include lambda expressions, streams, default methods, and more. Singleton design pattern ensures only one instance of a class exists.

• Java 8 features: lambda expressions, streams, default methods, functional interfaces

• Example: lambda expression - (a, b) -> a + b

• Singleton design pattern: ensures only one instance of a class is created

• Example: Singleton class with private constructor and static method to return instance

Using Java 8 stream to filter records in an array of strings

• Use stream() method to convert the array to a stream

• Use filter() method to specify the filtering condition

• Use collect() method to collect the filtered elements back into an array

WCF authentication is a mechanism to verify the identity of a client accessing a WCF service.

• WCF supports various authentication mechanisms such as Windows, username/password, certificates, and custom authentication.

• Authentication can be configured at the transport or message level.

• Transport-level authentication is performed before the message is decrypted, while message-level authentication is performed after decryption.

• Examples of authentication protocols supported by WCF i...read more

Spring Security is a powerful and customizable authentication and access control framework for Java applications.

• Spring Security provides comprehensive security services for Java EE-based enterprise software applications.

• It offers authentication, authorization, and protection against common security vulnerabilities.

• Spring Security is highly customizable and can be integrated with various authentication mechanisms like LDAP, OAuth, and more.

• It uses filters and interceptors to ...read more

Multithreading is the ability of a CPU to execute multiple threads concurrently.

• Multithreading allows for parallel execution of tasks, improving performance.

• Threads share the same memory space, but have their own stack and registers.

• Synchronization is necessary to prevent race conditions and ensure data consistency.

• Examples include web servers handling multiple requests simultaneously and video games rendering graphics while processing user input.

The question is nonsensical and does not make sense.

• The question does not have a clear meaning or context.

• It is likely a mistake or typo.

• Without more information, it is impossible to provide a meaningful answer.