Incedo Senior Java Developer Interview Questions and Answers

Q1. Wat is asp.net and how we cater for filter on this application
Ans. 
ASP.NET is a web application framework developed by Microsoft to build dynamic web pages and applications.
• ASP.NET is used to create web applications and websites

• It supports multiple programming languages like C#, VB.NET, etc.

• Filters in ASP.NET are used to intercept and modify HTTP requests and responses

• Filters can be used for authentication, logging, caching, etc.
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Q2. Wat is web api and how its related to the mvc application
Ans. 
Web API is a framework for building HTTP services that can be consumed by a variety of clients.
• Web API is a part of the ASP.NET framework

• It allows developers to build RESTful services

• It can be used to create APIs for web applications built using MVC

• Web API can return data in various formats such as JSON, XML, etc.

• It supports HTTP verbs such as GET, POST, PUT, DELETE, etc.
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Q1. Explain dependency injection, indexes in sql, SOLID principles.
Ans. 
Dependency injection is a design pattern where dependencies are injected into a class rather than created within the class itself.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing and maintenance of code.

• Example: Constructor injection, setter injection, and interface injection are common types of dependency injection.

• Indexes in SQL are used to improve the performance of...read more
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Q1. SOLID principles
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Q2. Microservice Architecture and Kafka
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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. Difference between Procedure, Packages and functions.
Ans. 
Procedures, Packages and Functions are all subprograms in PL/SQL with different characteristics.
• Procedures are subprograms that perform a specific task and may or may not return a value.

• Functions are subprograms that always return a value and can be used in SQL statements.

• Packages are a collection of related procedures, functions, variables, and other program constructs that can be used as a single unit.

• Packages provid...read more
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Q2. If table or view does not exist what does it mean
Ans. 
It means that the table or view does not exist in the database.
• The query will fail and return an error message.

• The application may crash or behave unexpectedly.

• The table or view may have been deleted or renamed.

• Check the spelling and syntax of the query.

• Make sure the database connection is established and valid.
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Q3. Difference Between Views and Materialized Views
Ans. 
Views are virtual tables while Materialized Views are physical tables.
• Views are created using SELECT statement while Materialized Views are created using CREATE MATERIALIZED VIEW statement.

• Views do not store data while Materialized Views store data.

• Views are updated dynamically while Materialized Views are updated manually or automatically based on refresh settings.

• Materialized Views are faster for read-heavy workloads...read more
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Q1. Details explanation about the projects and the concepts what we used.
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Round duration - 90 minutes
Round difficulty - Medium

We were supposed to give test in any time between 3 PM to 9 PM.

Q1. 
Total Unique Paths Problem Statement
You are located at point ‘A’, the top-left corner of an M x N matrix, and your target is point ‘B’, the bottom-right corner of the same matrix. Your task is to calcula...read more
Ans. 
The problem involves finding the total number of unique paths from the top-left to bottom-right cell of a matrix by moving only right or down.
• Use dynamic programming to solve the problem efficiently.

• Create a 2D array to store the number of unique paths at each cell.

• Initialize the first row and first column with 1 as there is only one way to reach them.

• For each cell (i, j), the number of unique paths is the sum of paths...read more
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Q2. 
Subtree Node Count Problem
We are provided with a tree containing 'N' nodes, numbered from 0 to N-1. The objective is to determine the total number of nodes within each subtree of the provided tree. Speci...read more
Ans. 
Given a tree with N nodes, find the number of elements in each subtree rooted at every node.
• Traverse the tree using Depth First Search (DFS) to calculate subtree sizes for each node.

• Use an array to store subtree sizes for each node, starting with leaf nodes having size 1.

• The subtree size of a node is the sum of subtree sizes of its children plus 1 for the node itself.
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Round duration - 120 minutes
Round difficulty - Medium

Pair Programming Interview( this round is similar to machine coding round) it started around 11 AM

Focus Areas: Problem solving and implementation of extensions.

The pair coding round is focused on OOPS concepts. You are paired with a TWer for this round. They let you code first for an hour and in the next hour they review your code and suggest changes which would improve the code structure, readability and make it modular and reusable and functional.
 

Q1. 
River Crossing: Help Ninja Cross Over
Ninja stands at the start of a wooden bridge over a river. Some segments of the bridge are damaged. The undamaged segments, marked as 'safe', are listed in an array S...read more
Ans. 
Check if Ninja can cross the river by jumping from one safe segment to another based on given constraints.
• Iterate through the 'SAFE' array and check if Ninja can make the required jumps to reach the last safe segment.

• Ensure that the next jump is either 'X' - 1, 'X', or 'X' + 1 units from the previous jump.

• Return 'true' if Ninja can successfully cross the river, otherwise return 'false'.
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Round duration - 120 minutes
Round difficulty - Medium

Students who were shortlisted from Pair Programming round was selected for this round around 3 PM. In this round there were two interviewer.

Q1. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Return the middle element of a singly linked list, or the one farther from the head if there are even elements.
• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• Return the element pointed to by the slow pointer
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Code paring round was conducted. they will assist you what there expectations are