FiberHome Java Developer Interview Questions and Answers

Q1. How to pull the large amount of data in spring data jpa
Ans. 
To pull large amount of data in Spring Data JPA, use pagination, lazy loading, and query optimization techniques.
• Use pagination to limit the amount of data retrieved in each query

• Implement lazy loading to fetch data only when needed

• Optimize queries by using indexes, avoiding N+1 query problem, and fetching only necessary columns
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Q2. Write singleton class
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Singleton class ensures only one instance of a class is created and provides a global point of access to it.
• Create a private static instance of the class

• Provide a private constructor to prevent instantiation

• Create a public static method to access the instance
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Q1. Asking related to java, and good knowledge of Oops concepts
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Q2. Basic java program
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Q1. Asking past project and technology that you are using
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Q2. API related question like rest, sop
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2 programmings on problem solving+ some mcqs on Java + spring boot+ mysql

Q1. Streams question to find the count of integers in a list and return it as 1 : 5, 2 : 3, ..
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Q2. Solid principles + spring theory different questions like jsonignore, pathvaroables, asynchronous communications, normalisation, etc.
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Q3. Questions on core java like oops, final,static, collections, generics
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Q4. Questions on project and each part of your services
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1st round some apt qns,some prgramming qns are they asked

Q1. C depth concepts and some prgram
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Q1. Some DSA questions they asked
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Q1. Reverse a linked list.
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Q2. Merge sort on a array/
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Q1. Define your experience
Ans. 
I have 5 years of experience in software development, specializing in web applications using Java, Spring, and Angular.
• 5 years of experience in software development

• Specialize in web applications

• Proficient in Java, Spring, and Angular
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Q2. Difference between HTML and CSS
Ans. 
HTML is used for structuring content on a webpage, while CSS is used for styling and formatting that content.
• HTML stands for HyperText Markup Language and is used to create the structure of a webpage.

• CSS stands for Cascading Style Sheets and is used to style the elements created with HTML.

• HTML uses tags to define elements like headings, paragraphs, images, and links.

• CSS uses selectors to target specific HTML elements a...read more
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Q3. Explain webpack?
Ans. 
Webpack is a module bundler for JavaScript applications.
• Webpack takes modules with dependencies and generates static assets representing those modules.

• It can handle various types of assets like JavaScript, CSS, and images.

• Webpack allows for code splitting, lazy loading, and hot module replacement.

• Common configuration options include entry point, output path, loaders, and plugins.
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Q4. Difference between span tag and div tag in HTML5?
Ans. 
Span tag is an inline element used for styling small portions of text, while div tag is a block-level element used for grouping and styling larger sections of content.
• Span tag is used for styling inline elements like text or images.

• Div tag is used for grouping and styling larger sections of content.

• Span tag does not create a new line, while div tag creates a new block-level element.

• Example: <span style='color: red;'...read more
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Q5. Explain HTML5 web storage?
Ans. 
HTML5 web storage is a way to store data locally in a user's browser.
• HTML5 web storage allows for storing key/value pairs locally in a user's browser.

• It provides two storage mechanisms - localStorage and sessionStorage.

• localStorage stores data with no expiration date, while sessionStorage stores data for one session only.

• Data stored in web storage is accessible across pages and browser sessions.

• Example: localStorage.se...read more
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Q1. What are the things that u do when your what app screen is blank
Ans. 
I would check for internet connection, restart the app, clear cache, and update the app.
• Check internet connection

• Restart the app

• Clear cache

• Update the app
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Q2. Simple python code
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Q1. Difference btwn jdk , jre and jvm
Ans. 
JDK is a development kit that includes JRE and tools for developing Java applications. JRE is a runtime environment for executing Java programs. JVM is a virtual machine that runs Java bytecode.
• JDK (Java Development Kit) includes JRE (Java Runtime Environment) and development tools like compiler and debugger.

• JRE (Java Runtime Environment) is a software package that provides the libraries and components necessary for ru...read more
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Q2. Difference btwn static and volatile
Ans. 
Static variables are shared among all instances of a class, while volatile variables are used to indicate that a variable's value will be modified by different threads.
• Static variables are initialized only once at the start of the program and retain their value throughout the program's execution.

• Volatile variables are used to ensure visibility of changes to variables across multiple threads.

• Static variables are accesse...read more
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Q3. What is final keyword
Ans. 
Final keyword is used in Java to declare constants, prevent method overriding, and prevent class inheritance.
• Used to declare constants - value cannot be changed once assigned

• Prevents method overriding - method cannot be overridden in child classes

• Prevents class inheritance - class cannot be extended
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Q4. Difference btwn paralle stream and stream
Ans. 
Parallel stream allows processing elements concurrently, while stream processes elements sequentially.
• Parallel stream can improve performance by utilizing multiple threads for processing.

• Stream processes elements one by one in a sequential manner.

• Example: stream().parallel() vs stream().sequential()
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Q5. What is stream used for
Ans. 
Streams are used in Java to process collections of objects in a functional style.
• Streams allow for concise and readable code when working with collections.

• They support operations like filter, map, reduce, and collect.

• Streams can be sequential or parallel, depending on the processing requirements.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(S
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