Morningstar Site Reliability Engineer Interview Questions and Answers

Basic concepts of programming

Q1. Programming concepts
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Q1. Core java concepts,Sql queries,2 coding question based on arrays and string
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Q2. Reverse the string
Ans. 
Reverse a given string
• Use a loop to iterate through the characters of the string

• Swap the characters from start to end to reverse the string

• Return the reversed string
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Q3. Find third highest salary from a employee table
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Q1. Advance java and project related
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Q2. Springboot and spring diff
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Q3. Springboot annotations used in your project
Ans. 
Some common Springboot annotations used in projects are @RestController, @Autowired, @RequestMapping, @Service, @Component, @Repository.
• @RestController - Used to define RESTful web services.

• @Autowired - Used for automatic dependency injection.

• @RequestMapping - Used to map web requests to specific handler methods.

• @Service - Used to indicate that a class is a service.

• @Component - Used to indicate that a class is a Spring...read more
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Q4. Springboot dependencies
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Q1. I was interviewed for 2yr experience. Normal Core java and basic sql question.
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Q2. Oops concept. Collections. Abstract class and interface. Sql procedures and functions Sql basic query
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Q1. Questions related to the projects worked till date. Explain your project. And counter question on your project.
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Q2. How many projects have you worked on? Explain each in short.
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Q1. In How many ways we can create objects in Java
Ans. 
Objects in Java can be created in multiple ways, including using new keyword, cloning, deserialization, and reflection.
• Using the 'new' keyword

• Cloning an existing object

• Deserialization from a file or network

• Using reflection to create objects dynamically
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Q2. Difference between Interface and Abstract Class
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Interface is a contract that defines the methods a class must implement, while abstract class can have both implemented and abstract methods.
• Interface methods are public and abstract by default, while abstract class can have abstract and non-abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract ...read more
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Q3. What is Serialization
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Serialization is the process of converting an object into a format that can be easily stored or transmitted.
• Serialization is used to convert complex data structures or objects into a stream of bytes.

• Serialized data can be stored in files, databases, or sent over a network.

• Common serialization formats include JSON, XML, and Protocol Buffers.
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Q1. JAVA, microservices
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Q2. DSA easy to medium questions
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3 coding questions and manager round

Q1. Oops and .net core
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Java Multiple choice questions and 2 coding questions

Q1. Collection in java works
Ans. 
Collection in Java is a framework that provides interfaces and classes to store and manipulate groups of objects.
• Collections can be used to store objects of any type.

• Some common collection types include ArrayList, LinkedList, HashSet, and TreeMap.

• Collections can be sorted, searched, and filtered using various methods.

• Iterators can be used to traverse through collections and perform operations on each element.

• Collection...read more
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Q2. Multithreading environment
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Q3. 2 coding questions and reduce its complexity
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Q1. Spring and cloud platform difference
Ans. 
Spring is a framework for building Java applications, while cloud platform provides infrastructure for deploying and scaling applications.
• Spring provides a set of tools and frameworks for building Java applications, while cloud platform provides infrastructure for deploying and scaling those applications.

• Spring can be used with any cloud platform, while cloud platform can support applications built with any framework.

• S...read more
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