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Interview Questions and Answers - Order By Newest

Q2701. Difference between reducer and meta reducers ?

Ans. A Meta Reducer is a higher order reducer or function ithat may receive a function as parameter or even return a function.

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Q2702. What is state management ?

NgRx

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Q2703. What is the flow or steps performed within the Reducer method ?

NgRx

Ans. Respond to the Action Type
Access the Pay load
Compose a New State
Respond a new state

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Q2704. Do we need to send the payload in the reducer ?

NgRx

Ans. No It's optional.

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Q2705. What is a component, service, directive and pipe ?

Angular Js

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Q2706. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

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Q2707. How can we make an S3 file public through Java program ?

Amazon Web Services (AWS)

Ans. We can get the object and then can set CannedAcl property as "PublicRead"

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Q2708. Have you ever worked on a project that involved reading RSS Feeds ? What framework / library did you use ?

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Q2709. Have you ever scrapped any content from a web page using any of the web scrapping library ?

Ans. Yes, I have used HTMLUnit and crawler4j for doing so.

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Q2710. Have you ever heard of the term "dry run" ? What does it mean ?

Testing

Ans. It means that the run is just for testing purpose.

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Q2711. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q2712. Have you ever changed IAM policy ?

Amazon Web Services (AWS)

Ans. Yes I did it for an execution role of a Lambda function to give it write access on S3 bucket.

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Q2713. How you can check Object is created or not in case of Singleton using Object class method ?

Design

Ans. Reflections-- setAccesible--avoid using enumns

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Q2714. If Java will die in next few year what will you do ?

Programming Language

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Q2715. Which Technology/Programming Language will Lead Future?

General

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Q2716. Does Hashtable in Java use stack operation ?

Core Java

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Q2717. What is the difference between bubble sort using Java and C++ ?

Programming Language

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Q2718. What are the main limitations of Java as programming language?

General

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Q2719. Which Java libraries are most useful for your work as a Java developer?

General

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Q2720. What is the difference between try-catch and @ExceptionHandler in Java/Spring Boot?

Spring Boot

Ans. ExceptionHandler is Used to handle at Method level

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Q2721. What is the difference between the 'A' and "A" in Java ?

Core Java

Ans. 'A' is a character whereas "A" is a String.

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Q2722. What are the advantages of going serverless against reserved servers ?

Server

Ans. Quick Turnaround Time and Quick Time to Market
No Worry about the infrastructure , low maintenance
Cost only for use , not for reservation.
Multiple small applications instead of one big. Results in better uptime and mainetnability.

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Q2723. What is DDOS attack ?

Security

Ans. DDOS is denial of service attack in which the hacker seeks to make a machine or resource unavailable to its expected users by disrupting services.

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Q2724. Why is Java platform independent ?

Core Java

Ans. Platform independent language means once compiled you can execute the program on any platform (OS). Java is platform independent. Because the Java compiler converts the source code to bytecode, which is Intermediate Language. Bytecode can be executed on any platform (OS) using JVM( Java Virtual Machine).

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Q2725. Explain hibernate associations.

Hibernate

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Q2726. Have you ever used PowerMock ? If yes , which mocking framework you have used it with ?

PowerMock

Ans. Yes, I have used PowerMockito with Mockito.

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Q2727. How can you verify if there were interactions with a static method using PowerMock ?

PowerMock

Ans. We can use PowerMockito.verifyStatic for this purpose

PowerMockito.verifyStatic(VerificationModeFactory.times(1));
<Class_Name>.<static_method_name>;

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Q2728. What does the following code

MockitoAnnotations.initMocks(this);

Mockito

Ans. Initializes objects annotated with Mockito annotations

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Q2729. What is doCallRealMethod() method used for ?

PowerMock

Ans. When we Mock an object and then make a reference to any method using mocked object reference , java never makes a call to that method and looks for mocked value to be returned or null if none specified. But If we want that to be overridden and want java to make actual method call upon using mocked object reference, this method can be used.

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Q2730. What is @EnableSptringMVC ?

Spring

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