Innova Solutions Senior Developer Interview Questions and Answers

Q1. What is singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the application.
• Singleton classes are often used for logging, caching, database connections, and thread pools.

• They have a private constructor to prevent multiple instances from being created.

• The class typically provides a static method to access the single instance.
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Q2. What is Method reference
Ans. 
Method reference is a shorthand syntax for lambda expressions to call a method.
• Method reference is used to refer to a method without invoking it.

• It can be used to make code more concise and readable.

• There are four types of method references: static, instance, constructor, and array constructor.
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Q1. Array qs reverse
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Q2. Question about angular and react
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Sample code round to implement the weather API

Q1. Discussion about salary package
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Q1. Explain oops concepts
Ans. 
Object-oriented programming concepts like 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 details and showing only the ne
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Q2. Explain solid principles
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subcla...read more
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Q1. Explain java 8 features
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Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise way.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements.

• Default methods allow interfaces to have method implementations.

• Example: Lambda exp...read more
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Q2. Spring boot architecture
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Simple crisp and to the point questions no extra stuff

Q1. General to your technical background
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Q1. General and to the the point mentioned in your cv
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Q1. Techical interview on itsm process
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Q1. What is saveable datapage
Ans. 
A saveable datapage is a data page in Pega that can be saved to the database for future reference.
• Saveable datapages allow for storing and retrieving data in Pega applications.

• They can be used to store user input, system-generated data, or any other relevant information.

• Saveable datapages can be accessed and modified throughout the application as needed.
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