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Insolutions Global
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Oops concept, spring framework, java core
OOPs concepts refer to Object-Oriented Programming principles such as Inheritance, Encapsulation, Polymorphism, and Abstraction.
Inheritance: Allows a class to inherit properties and behavior from another class.
Encapsulation: Bundling data and methods that operate on the data into a single unit.
Polymorphism: Ability to present the same interface for different data types.
Abstraction: Hiding the complex implementation det
Hibernate is an ORM tool that simplifies database interactions in Java applications.
Hibernate configuration involves setting up database connection details in hibernate.cfg.xml
Entities are mapped to database tables using annotations or XML mapping files
SessionFactory is created to obtain Session objects for database operations
Transactions are managed using Session object to ensure data consistency
Example: Entity class ...
I applied via Recruitment Consulltant and was interviewed before May 2023. There were 2 interview rounds.
Constructors are special methods used to initialize objects, while methods are functions that perform specific tasks in a class.
Constructors are called when an object is created, while methods are called to perform actions on objects.
Constructors have the same name as the class and do not have a return type, while methods have a different name and can have a return type.
Constructors are used to set initial values for o...
Basics aptitude
Insolutions Global interview questions for designations
I applied via Naukri.com and was interviewed in Jun 2021. There were 3 interview rounds.
Map is a built-in function in many programming languages that allows you to transform data from one form to another.
Map applies a function to each element in an array and returns a new array with the transformed elements.
It can also be used with other data structures like objects and sets.
Internally, map uses a loop to iterate over each element in the array and applies the provided function to it.
The transformed elemen...
Difference between save and persist in Hibernate
Save method returns the generated ID immediately while persist method returns void
Save method can be called outside of a transaction while persist method must be called within a transaction
Save method can be used with detached objects while persist method cannot
Save method can be used with transient objects while persist method cannot
I applied via Company Website and was interviewed before Dec 2020. There was 1 interview round.
Top trending discussions
I applied via Company Website and was interviewed before Jan 2021. There were 3 interview rounds.
Routing through a proxy involves configuring the proxy server to forward requests to the destination server.
Configure the proxy server to listen for incoming requests
Configure the proxy server to forward requests to the destination server
Configure the client to use the proxy server for outgoing requests
Use a proxy server to bypass network restrictions or improve performance
Examples: Nginx, Apache, Squid
I applied via Naukri.com and was interviewed before Jun 2021. There were 2 interview rounds.
Hacker rank long coding questions with questions for python,c++,javascript , data bast related questions
I appeared for an interview in Jun 2017.
Ajax calls allow for asynchronous communication between client and server without reloading the page.
Ajax stands for Asynchronous JavaScript and XML
Uses XMLHttpRequest object to send and receive data
Allows for partial page updates without reloading the entire page
Can handle data in various formats such as JSON, XML, HTML, and plain text
Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});
REST is lightweight and uses HTTP while SOAP is XML-based and has more features.
REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.
REST is stateless while SOAP can maintain state.
REST is faster and easier to use while SOAP is more secure and reliable.
REST is used for web services while SOAP is used for enterprise-level services.
Example of REST: Twitter API. Example of SOAP: Amazon Web Serv
GET and POST are HTTP methods used for sending data to a server.
GET is used to retrieve data from a server
POST is used to submit data to a server
GET requests can be cached and bookmarked
POST requests are not cached and cannot be bookmarked
GET requests have length restrictions
POST requests have no length restrictions
GET requests are less secure than POST requests
Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.
Also known as publish-subscribe pattern
Used in event-driven systems
Allows loose coupling between objects
Example: A weather station broadcasts weather updates to multiple displays
Example: A stock market ticker notifies multiple investors of stock price changes
Singleton is a design pattern that restricts the instantiation of a class to a single object.
Singleton ensures that only one instance of a class exists in the entire application.
It provides a global point of access to the instance.
Commonly used in scenarios where a single instance needs to coordinate actions across the system.
Example: Database connection manager, logger, configuration manager.
Immutable in Java refers to objects whose state cannot be changed after creation.
String, Integer, and other wrapper classes are immutable in Java.
Immutable objects are thread-safe and can be shared without synchronization.
To create an immutable class, make all fields final and private, and don't provide setters.
Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.
Creating immutable in Java
Use final keyword to make variables immutable
Use private constructor to prevent object modification
Use defensive copying to prevent modification of mutable objects
Use enum to create immutable objects
Use String class to create immutable strings
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database co...
CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.
CORS allows web servers to specify which origins are allowed to access its resources
It is implemented using HTTP headers
CORS prevents malicious websites from accessing sensitive data from other websites
Examples of resources that may be restricted by CORS include cook
CORS can be overcome by configuring the server to allow cross-origin requests.
Configure the server to include the Access-Control-Allow-Origin header
Use JSONP (JSON with Padding) to bypass CORS restrictions
Use a proxy server to make the request on behalf of the client
Use a browser extension to disable CORS restrictions during development
Use a server-side proxy to forward requests to the target server
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