CitiusTech Senior Java Developer Interview Questions and Answers

Q1. How annotation works?
Ans. 
Annotations in Java provide metadata about a program that can be used by the compiler or at runtime.
• Annotations start with the @ symbol.

• Annotations can be used to provide information to the compiler or to runtime environments.

• Annotations can be used to define custom metadata for classes, methods, fields, etc.

• Annotations can also be used for code generation, documentation, and validation.

• Examples of annotations in Java ...read more
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Q2. CondurentSkipListMap, how does it work
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ConcurrentSkipListMap is a concurrent, sorted map implementation in Java.
• ConcurrentSkipListMap is a concurrent version of SkipListMap, which is a sorted map implementation based on skip list data structure.

• It allows multiple threads to access and modify the map concurrently.

• It provides logarithmic time complexity for most operations, making it efficient for concurrent access.

• Example: ConcurrentSkipListMap
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1 Assignment which you need to solve in front of the interviewer

Q1. Questions on Java Streams
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Q2. Questions on springboot
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Q1. Hierarchy of collection framework,
Ans. 
Collection framework in Java provides a hierarchy of interfaces and classes to store and manipulate groups of objects.
• Interfaces: Collection, List, Set, Queue, Map

• Classes: ArrayList, LinkedList, HashSet, TreeSet, HashMap, TreeMap

• Collections class provides utility methods for working with collections
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Q2. Questions on Spring boot, microservices
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Q1. Java 8 features
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Q2. JPA implementation
Ans. 
JPA implementation is a Java specification for mapping Java objects to relational databases.
• JPA stands for Java Persistence API.

• It provides a set of annotations and APIs for managing relational data in Java applications.

• JPA allows developers to write database-independent code.

• It supports object-relational mapping (ORM) and provides features like entity mapping, query language, and transaction management.

• Popular JPA imp...read more
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Q3. JDBC Connection steps
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JDBC Connection steps
• Load the JDBC driver class

• Establish a connection to the database using the DriverManager class

• Create a statement object to execute SQL queries

• Execute the SQL query and retrieve the results

• Process the results

• Close the statement and connection
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Q4. Lambda expression
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Coding questions and core java concepts needs to be brush up

Find the pair of numbers in the array whose sum is equal to target value

Q1. Junit vs Mockito Spring boot related questions AWS related questions Java Related Questions Coding on find the smallest second number
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2 Basic Programsl on LRU amd strings

Q1. Core java , java 8 concepts, spring core concepts
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Q1. Salary discussion
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Q1. Policy briefing
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