Ness Digital Engineering Development Leader Interview Questions and Answers for Experienced

Hackerrank coding round.

Q1. Questions and coding testing your OOPS knowledge
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Q1. Every tech stack, SQL, OOPS, JAVA
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Q1. Why functional interface when we have interface
Ans. 
Functional interfaces provide a single abstract method for functional programming in Java.
• Functional interfaces allow for lambda expressions and method references to be used as instances of the interface.

• Interfaces with multiple abstract methods cannot be used for lambda expressions.

• Example: java.util.function.Function is a functional interface with a single abstract method apply().
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Q2. Java 8 explain all features in short
Ans. 
Java 8 introduced new features like lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions: Allows writing concise code by enabling functional programming.

• Streams: Provides a way to work with sequences of elements efficiently.

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

• Default methods: Allows adding new methods to interfaces without br
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Q3. If one functional interface can extend another interface
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Yes, one functional interface can extend another interface in Java.
• Functional interfaces can extend other functional interfaces in Java.

• The child interface can have only one abstract method, but can inherit default methods from the parent interface.

• Example: interface Parent { void method1(); } interface Child extends Parent { void method2(); }
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One coding question with 40-45 mcq

Q1. 2 coding questions from array
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Q2. In given array find the sum a*a+b*b=c*c
Ans. 
Use a nested loop to iterate through the array and check for the sum of squares of two elements equal to the square of a third element.
• Iterate through the array using a nested loop to compare all possible combinations of elements.

• Calculate the sum of squares of two elements and check if it equals the square of a third element.

• Return the elements if a match is found, otherwise continue iterating.
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Q1. Core java questions, springboot, one string coding question
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Q1. How agile working methods
Ans. 
Agile working methods involve iterative development, collaboration, flexibility, and continuous improvement.
• Agile methods prioritize customer satisfaction through early and continuous delivery of valuable software.

• Teams work in short iterations called sprints, focusing on delivering working software frequently.

• Collaboration between team members, stakeholders, and customers is essential for success.

• Flexibility to adapt ...read more
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Q2. Java oops concepts
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Contiguous array in java

Q1. Microservices architecture
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Q2. Saga design pattern
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Q1. What is java and its features ?
Ans. 
Java is a high-level programming language known for its platform independence and object-oriented features.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• It is object-oriented, allowing for the creation of reusable code and modular programs

• Java is known for its robust standard library, providing a wide range of pre-built functionality

• It supports multithreading, allowing ...read more
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Q2. What is java 8 and features
Ans. 
Java 8 is a major release of the Java programming language with new features like lambda expressions, streams, and default methods.
• Lambda expressions allow you to treat functionality as a method argument.

• Streams provide a new abstraction to work with sequences of elements.

• Default methods allow interfaces to have method implementations.

• Date and Time API provides a new way to work with dates and times.

• Optional class help
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Q1. Explain your Project. What features you have made Git related questions like code merge pull Jira tool Java questions mostly from collectiions Springboot related question Then some design pattern.
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Q1. Spring boot and microservices
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Q2. Commonly used functional interfaces in your app.
Ans. 
Commonly used functional interfaces include Predicate, Consumer, Supplier, and Function.
• Predicate: used for boolean-valued functions of one argument.

• Consumer: used for operations that take in one argument and return no result.

• Supplier: used for operations that take no arguments and return a result.

• Function: used for operations that take in one argument and return a result.
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