Envirotech Services Interview Questions and Answers

Emulator replicates both hardware and software of the original device, while simulator only replicates the software.

• Emulator replicates both hardware and software of the original device

• Simulator only replicates the software

• Emulator is slower but more accurate, simulator is faster but less accurate

• Examples: Android Emulator for testing mobile apps, Flight Simulator for pilot training

Method overloading is when multiple methods have the same name but different parameters, while method overriding is when a subclass provides a specific implementation of a method that is already provided by its superclass.

• Method overloading involves creating multiple methods in the same class with the same name but different parameters.

• Method overriding occurs when a subclass provides a specific implementation of a method that is already provided by its superclass.

• Method over...read more

APIs can be categorized into different types such as REST, SOAP, GraphQL, and RPC.

• RESTful APIs: Representational State Transfer APIs use standard HTTP methods like GET, POST, PUT, DELETE for communication.

• SOAP APIs: Simple Object Access Protocol APIs use XML for message exchange over a network.

• GraphQL APIs: Query language for APIs that allows clients to request only the data they need.

• RPC APIs: Remote Procedure Call APIs allow a program to execute code on a remote server.

Different types of testing include functional testing, non-functional testing, manual testing, automated testing, regression testing, and performance testing.

• Functional testing: Testing the functionality of the software against the requirements.

• Non-functional testing: Testing aspects like performance, usability, and security.

• Manual testing: Testing performed manually by testers.

• Automated testing: Testing performed using automation tools.

• Regression testing: Testing to ensure t...read more

Validating API through Postman involves sending requests, receiving responses, and verifying data.

• Create a new request in Postman and enter the API endpoint

• Add any required headers, parameters, or body data

• Send the request and check the response status code

• Verify the response body for expected data or values

• Use assertions in Postman to validate response data

• Save the request in a collection for future testing

Java program to print patterns using loops

• Use nested loops to print the desired pattern

• Patterns can be created using characters or numbers

• Patterns can be simple shapes or more complex designs