Infosys Senior Software Developer Interview Questions and Answers

Q1. What is Middleware
Ans. 
Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and share data.
• Middleware facilitates communication between different software applications or components

• It can handle tasks such as data transformation, security, and routing

• Examples of middleware include message brokers like RabbitMQ, web servers like Apache Tomcat, and API gateways like Kong
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Q1. Jdk jre what is class loader and all
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Class loader is a part of Java Runtime Environment (JRE) that loads classes and interfaces at runtime.
• Class loader is responsible for locating and loading the necessary class files into memory.

• It follows a hierarchical structure and delegates the class loading to parent class loaders.

• Class loaders can be customized to load classes from different sources like file system, network, or database.

• They provide a level of sec...read more
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Q2. What isfinal andfinally
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final is a keyword in Java used to declare a constant value. finally is a block used in exception handling to ensure a piece of code is always executed.
• final is used to declare a variable whose value cannot be changed

• finally is used in a try-catch block to specify a block of code that will always be executed, regardless of whether an exception is thrown or not
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Q3. What is arraylist
Ans. 
ArrayList is a resizable array implementation in Java.
• ArrayList is a class in Java's Collection framework.

• It provides dynamic resizing, unlike regular arrays.

• It can store objects of any type, including strings.

• ArrayLists can grow or shrink dynamically as elements are added or removed.

• Example: ArrayList<String> names = new ArrayList<String>();
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Q4. What is hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap is part of the Java Collections Framework.

• It allows null values and null keys.

• Keys must be unique, but values can be duplicated.

• Basic operations include put(key, value), get(key), remove(key), and containsKey(key).

• Example: HashMap<String, Integer> map = new HashMap<>();
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Q1. Ask about expected salaries and all
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Q1. What is Microservices
Ans. 
Microservices are a software development technique where applications are broken down into smaller, independent services that communicate with each other.
• Microservices are designed to be small, focused, and independently deployable services.

• Each microservice typically performs a single function or task.

• Microservices communicate with each other through APIs.

• They can be developed, deployed, and scaled independently.

• Examp...read more
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Q2. What's the difference between Microservices and API
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Microservices are a way to design software applications as a collection of small, independent services that communicate with each other via APIs.
• Microservices are a software architectural style where applications are composed of small, independent services that communicate over well-defined APIs.

• APIs (Application Programming Interfaces) are a set of rules and protocols that allow different software applications to comm...read more
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Core java , colletions

Q1. Basic Java topics
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Q2. System design topics
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Q1. Write sample Interface with Implementation
Ans. 
Sample Interface with Implementation for a Senior Software Developer interview
• Create an interface with method signatures

• Implement the interface in a class

• Use the interface to define behavior in other classes
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Q2. Write a query to select ID from table one but that Id should not presented in table two
Ans. 
Query to select IDs from table one not present in table two
• Use a LEFT JOIN to combine the two tables

• Filter the results where the ID from table one is NULL in table two
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Q3. Select student list for 3rd most highest mark from the student table.
Ans. 
Select student list for 3rd most highest mark from the student table.
• Order the student table by marks in descending order

• Skip the first two highest marks

• Select the student list for the 3rd highest mark
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Asked about core JS concepts and excercise