Universal Hunt Interview Questions and Answers

Java interview questions covering topics like abstraction, inheritance, garbage collector, class loader, Spring security, bean scopes, wait-notify, class vs object level local, ArrayList vs LinkedList, Singleton class, and RestController vs Controller.

• Abstraction focuses on hiding implementation details while inheritance allows a class to inherit properties and methods from another class.

• Garbage collector is a program that automatically frees up memory by deleting objects tha...read more

Spring Boot provides a simplified way to create stand-alone, production-grade Spring-based Applications.

• Rapid application development

• Embedded server for easy deployment

• Auto-configuration for setting up Spring projects quickly

• Microservices support

• Actuator for monitoring and managing applications

To make a class immutable in Java, make it final, declare all fields as private and final, and provide only getter methods.

• Declare the class as final to prevent inheritance

• Declare all fields as private and final to prevent modification

• Provide only getter methods to access the fields

• Avoid providing setter methods or any other methods that modify the state of the class

An interface is a contract that defines a set of methods that a class must implement, while an abstract class is a class that cannot be instantiated and can contain both abstract and non-abstract methods.

• An interface can only have abstract methods, while an abstract class can have both abstract and non-abstract methods.

• A class can implement multiple interfaces, but can only extend a single abstract class.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract cla...read more

HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.

• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in multi-threaded environments.

Microservices architecture in Spring is a way of designing software applications as a collection of loosely coupled services.

• Microservices architecture breaks down a large application into smaller, independent services that can be developed, deployed, and scaled independently.

• Spring Boot and Spring Cloud are commonly used frameworks for building microservices in Java.

• Each microservice typically has its own database and communicates with other services through APIs.

• Microservic...read more