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OOP in Java is a programming paradigm based on objects, promoting code reusability and modularity through four main principles.
Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: A class 'Car' with attributes like 'speed' and methods like 'accelerate()'.
Inheritance: Mechanism to create a new class using properties and methods of an existing class. Example: 'ElectricC...
Polymorphism allows objects to be treated as instances of their parent class, enabling method overriding and interface implementation.
Method Overriding: A subclass can provide a specific implementation of a method that is already defined in its superclass. Example: A class 'Animal' with a method 'sound()', and subclasses 'Dog' and 'Cat' overriding it.
Method Overloading: Multiple methods can have the same name but ...
Java is a versatile, object-oriented programming language designed for portability across platforms and ease of use.
Platform Independence: Java code is compiled into bytecode, which can run on any device with a Java Virtual Machine (JVM), ensuring 'write once, run anywhere'.
Object-Oriented: Java follows the principles of object-oriented programming (OOP), allowing for encapsulation, inheritance, and polymorphism, ...
JDBC is a Java API for connecting to and interacting with databases.
JDBC stands for Java Database Connectivity.
It provides a standard interface for connecting to databases.
JDBC drivers are used to connect to specific databases.
JDBC can be used to execute SQL queries and retrieve results.
Example: Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","u...
Spring Boot provides easy and efficient ways to create RESTful services.
Create a Spring Boot project with Spring Web dependency
Add @RestController annotation to the controller class
Use @RequestMapping annotation to map HTTP requests to methods
Return data using ResponseEntity class
Use @PathVariable annotation to get dynamic values from URL
Use @RequestBody annotation to get data from request body
Use @PostMapping, @G...
To handle SQL injection vulnerabilities, implement secure coding practices and use prepared statements.
Use prepared statements and parameterized queries to prevent direct SQL injection.
Validate and sanitize user inputs to ensure they conform to expected formats.
Employ ORM (Object-Relational Mapping) frameworks that abstract SQL queries.
Implement web application firewalls (WAF) to detect and block SQL injection att...
Axios is a popular JavaScript library used for making HTTP requests.
Axios is commonly used in frontend applications to communicate with backend servers.
It supports promises and can be used in both browser and Node.js environments.
Example: axios.get('https://api.example.com/data')
Friend function is a function that is not a member of a class but has access to its private and protected members.
It is declared with the...
Collection is a framework that provides an architecture to store and manipulate a group of objects.
HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values efficiently.
Internal working of HashMap involves hashing the key to find the index of the bucket where the key-value pair is stored.
Lambda expressions are anonymous functions that allow you to pass behavior as an argument to a...
Servlet and JSP life cycle involves initialization, request processing and destruction.
Servlet life cycle includes init(), service() and destroy() methods.
JSP life cycle includes translation, compilation, initialization, and request processing.
Servlet container manages the life cycle of servlets and JSPs.
Servlet and JSP objects are created and initialized during initialization phase.
During request processing phase...
I am looking for a competitive salary that reflects my skills and experience in software development.
Based on my research, the average salary for a software developer in this region is between $80,000 and $100,000.
I have over 5 years of experience in full-stack development, which I believe justifies a salary towards the higher end of that range.
I am open to discussing the entire compensation package, including benefits...
I appeared for an interview in Apr 2025, where I was asked the following questions.
I am excited to join this company for its innovative projects, collaborative culture, and opportunities for professional growth.
Innovative Projects: The company is known for its cutting-edge technology solutions, such as developing scalable applications that enhance user experience.
Collaborative Culture: I appreciate the emphasis on teamwork and open communication, which fosters creativity and allows for diverse ideas ...
Java is a versatile, object-oriented programming language designed for portability across platforms and ease of use.
Platform Independence: Java code is compiled into bytecode, which can run on any device with a Java Virtual Machine (JVM), ensuring 'write once, run anywhere'.
Object-Oriented: Java follows the principles of object-oriented programming (OOP), allowing for encapsulation, inheritance, and polymorphism, which...
OOP in Java is a programming paradigm based on objects, promoting code reusability and modularity through four main principles.
Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: A class 'Car' with attributes like 'speed' and methods like 'accelerate()'.
Inheritance: Mechanism to create a new class using properties and methods of an existing class. Example: 'ElectricCar' i...
Polymorphism allows objects to be treated as instances of their parent class, enabling method overriding and interface implementation.
Method Overriding: A subclass can provide a specific implementation of a method that is already defined in its superclass. Example: A class 'Animal' with a method 'sound()', and subclasses 'Dog' and 'Cat' overriding it.
Method Overloading: Multiple methods can have the same name but diffe...
I appeared for an interview before Jul 2024, where I was asked the following questions.
JSP and Servlets have distinct lifecycles involving initialization, request handling, and destruction phases.
1. Servlet Lifecycle: Init -> Service -> Destroy.
2. JSP Lifecycle: Translation -> Compilation -> Initialization -> Execution -> Destruction.
3. Init: Servlet/JSP is loaded into memory and initialized once.
4. Service: Handles requests; for Servlets, this is done via doGet/doPost methods.
5. JSP Tr...
posted on 24 Jun 2024
I applied via Naukri.com and was interviewed in May 2024. There was 1 interview round.
I applied via Campus Placement and was interviewed in Dec 2023. There were 2 interview rounds.
Easy to moderate question
Axios is a popular JavaScript library used for making HTTP requests.
Axios is commonly used in frontend applications to communicate with backend servers.
It supports promises and can be used in both browser and Node.js environments.
Example: axios.get('https://api.example.com/data')
Friend function is a function that is not a member of a class but has access to its private and protected members.
It is declared with the keyw...
I applied via Referral and was interviewed in Jan 2023. There were 4 interview rounds.
General asked aptitude
Focus most on profit lost, percentage
I appeared for an interview before Feb 2024.
A basic aptitude test includes questions on logical reasoning, analytical reasoning, and quantitative reasoning.
I appeared for an interview in Aug 2022.
try catch and finally are keywords used in exception handling in programming languages.
try block contains the code that may throw an exception
catch block catches the exception thrown by the try block and handles it
finally block contains the code that is executed regardless of whether an exception is thrown or not
try-catch-finally is used to handle errors and prevent program crashes
Example: try { //code that may throw a...
Why are you leaving your company
I applied via Naukri.com and was interviewed before May 2023. There was 1 interview round.
Collection is a framework that provides an architecture to store and manipulate a group of objects.
HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values efficiently.
Internal working of HashMap involves hashing the key to find the index of the bucket where the key-value pair is stored.
Lambda expressions are anonymous functions that allow you to pass behavior as an argument to a meth...
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The duration of Servosys Solutions interview process can vary, but typically it takes about less than 2 weeks to complete.
based on 15 interview experiences
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