Krios info Solution Java Developer Interview Questions, Process, and Tips

I am a Java Developer with 5 years of experience in developing web applications.

• I have a strong understanding of Java programming language and its frameworks like Spring and Hibernate.

• I have experience in developing RESTful APIs and integrating with databases like MySQL and Oracle.

• I am familiar with front-end technologies like HTML, CSS, and JavaScript.

• I have worked on projects involving e-commerce, finance, and health...read more

OOPs concepts are the fundamental principles of object-oriented programming.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and methods together to protect data from outside interference.

• Inheritance: Acquiring properties and behavior of a parent class by a child class.

• Polymorphism: Ability of an object to take many forms or have multiple behaviors.

• Example: A...read more

Java 8 introduced several new features including lambda expressions, streams, and default methods.

• Lambda expressions for functional programming

• Streams for efficient processing of large data sets

• Default methods for backward compatibility

• Date and Time API for improved handling of date and time

• Optional class for null checks

• Nashorn JavaScript engine for improved performance

• Parallel array sorting for improved performance

• Typ...read more

Dependency Injection is a design pattern that allows objects to be injected into a class rather than creating them within the class.

• Dependency Injection helps to reduce tight coupling between classes

• It makes code more modular and easier to test

• There are three types of Dependency Injection: Constructor Injection, Setter Injection, and Interface Injection

• Example: Instead of creating a database connection object within a ...read more

HashSet is a collection that uses hashing to store elements. It does not allow duplicates.

• HashSet internally uses a HashMap to store elements.

• The elements are stored as keys in the HashMap with a dummy value.

• When an element is added, its hashcode is calculated and used to find the bucket in the HashMap.

• If the bucket is empty, the element is added as a key with a dummy value.

• If the bucket is not empty, the element is co...read more