Flynaut SaaS Java Full Stack Developer Interview Questions and Answers for Experienced

Q1. Questions related to Java 8 features, Springboot annotations etc
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Basic logical reasoning questions that are easy to crack . 90 mins duration

Q1. Method overloading vs overriding, oops concept. Interface
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Q2. Threading, Collection framework
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Q3. Spring boot , Jpa , My Sql
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Q1. Basic questions like location preference and shift preference
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Q1. What is abstract class
Ans. 
Abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.
• Cannot be instantiated directly

• Can have abstract methods that must be implemented by subclasses

• Can have non-abstract methods that can be inherited by subclasses

• Used to define common behavior for subclasses
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Q2. What are access modifier
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Access modifiers are keywords in programming languages that define the accessibility of classes, methods, and variables.
• Access modifiers control the visibility and accessibility of classes, methods, and variables in a program.

• Common access modifiers include public, private, protected, and default (package-private).

• Public access modifier allows access from any other class.

• Private access modifier restricts access to only...read more
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Q1. Git version tool
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Q2. Project related question
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Q1. Salary expectation
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Q1. What is concurrent hashmap
Ans. 
ConcurrentHashMap is a thread-safe implementation of the HashMap class in Java.
• ConcurrentHashMap allows multiple threads to read and write to the map concurrently without causing any data corruption.

• It achieves thread-safety by dividing the map into segments, each of which can be locked independently.

• ConcurrentHashMap is more efficient than using synchronized collections for concurrent access.

• Example: ConcurrentHashMap
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Q2. How is dependency injection different from dependency inversion
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Dependency injection is a design pattern where dependencies are provided to a class from the outside, while dependency inversion is a principle that states high-level modules should not depend on low-level modules, but both should depend on abstractions.
• Dependency injection is a technique to achieve dependency inversion.

• Dependency injection involves providing dependencies to a class from the outside, typically through ...read more
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Q3. If I add 2 same attribute values for a object to a set...will I see 2 objects in the set, if yes what changes you make to the code to insert unique objects to a set
Ans. 
No, you will not see 2 objects in the set. To insert unique objects to a set, you can override the equals() and hashCode() methods in the object class.
• In a set, each element must be unique based on the equals() method. If you add 2 objects with the same attribute values, only one will be stored in the set.

• To ensure uniqueness, override the equals() and hashCode() methods in the object class. This will define how object...read more
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Q4. What is serialisation, externalisation, serializable
Ans. 
Serialisation is the process of converting an object into a format that can be easily stored or transmitted. Externalisation is a way to customize the serialization process. Serializable is an interface in Java that allows objects to be serialized.
• Serialisation is the process of converting an object into a format that can be easily stored or transmitted

• Externalisation is a way to customize the serialization process

• Seri...read more
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Q5. Write a Generic method to add string or integer to List or List
Ans. 
Create a generic method to add string or integer to List or List
• Create a generic method that takes a List and an element as input

• Use Java generics to specify the type of List and element

• Check the type of List and element, then add the element to the List
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Q1. Oops concepts, SQL queries, observable and subscribe in angular
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Q1. Tell about design pattern
Ans. 
Design patterns are reusable solutions to common problems in software design.
• Design patterns help in creating maintainable, scalable, and efficient code.

• Some common design patterns include Singleton, Factory, Observer, and Strategy.

• Design patterns can be categorized into three main groups: creational, structural, and behavioral.
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Q2. Functional Overloading vs function overriding
Ans. 
Functional overloading involves multiple functions with the same name but different parameters, while function overriding involves a subclass providing a specific implementation for a method in its superclass.
• Functional overloading allows multiple functions with the same name but different parameters.

• Function overriding occurs in inheritance when a subclass provides a specific implementation for a method in its supercl...read more
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Q3. What is hoisting in Java script
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Hoisting in JavaScript is a behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their initializations.

• Function declarations are fully hoisted, including their definitions.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q4. What is memonisation
Ans. 
Memoization is a technique used in computer science to store the results of expensive function calls and return the cached result when the same inputs occur again.
• Memoization helps in improving the performance of a program by reducing redundant calculations.

• It is commonly used in dynamic programming to optimize recursive algorithms.

• Example: Fibonacci sequence calculation can be optimized using memoization to store prev
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Q5. What is promise, closure ?
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation. A closure is a function defined within another function that has access to its parent function's scope.
• Promise is used to handle asynchronous operations in JavaScript.

• Promises can be in one of three states: pending, fulfilled, or rejected.

• Closures allow functions to access variables from their parent function even after...read more
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Q6. Difference between == && ===
Ans. 
== is used for equality comparison, while === is used for strict equality comparison.
• == checks for equality of values, while === checks for equality of values and data types.

• == can perform type coercion, while === does not.

• == is less strict than ===.

• Example: 1 == '1' returns true, but 1 === '1' returns false.
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Q1. Questions about current projects
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Q2. Questions about AWS
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Q1. What is closures in JS ?
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope, even after the outer function has finished executing.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables, parameters, and even the outer function's return value.

• Closures are useful for creating private variables and data encapsulation.

• They can be ...read more
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Q2. Diff props and state ?
Ans. 
Props and state are both used in React to manage and pass data, but they have different purposes and behaviors.
• Props are read-only and passed from parent components to child components.

• State is mutable and managed within a component.

• Props are used to pass data from a parent component to a child component.

• State is used to manage and update data within a component.

• Props are passed as attributes to a component in JSX.

• Stat...read more
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Q3. How to optimise the performance ?
Ans. 
Performance optimization involves identifying and resolving bottlenecks to improve the efficiency of software.
• Identify and analyze performance bottlenecks

• Optimize algorithms and data structures

• Improve database performance through indexing and query optimization

• Use caching techniques to reduce database and network calls

• Minimize network latency by optimizing network requests

• Optimize front-end code by reducing DOM manipul...read more
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Q4. Diff between class based or function based component ?
Ans. 
Class-based components are ES6 classes that extend React.Component, while function-based components are functions that return JSX.
• Class-based components are more feature-rich and have access to lifecycle methods.

• Function-based components are simpler and easier to read and test.

• Class-based components can have state and use lifecycle methods like componentDidMount and componentDidUpdate.

• Function-based components can use ...read more
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Q5. What is es6 features ?
Ans. 
ES6 (ECMAScript 2015) introduced several new features to JavaScript, enhancing its functionality and making it more efficient.
• Arrow functions: concise syntax for writing functions

• Let and const: block-scoped variables

• Template literals: easier string interpolation

• Destructuring assignment: extracting values from arrays or objects

• Spread syntax: expanding elements in arrays or objects

• Classes: syntactical sugar for creating ...read more
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