Incedo 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
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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

Q1. Oops concept in java
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Oops concept in Java refers to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the implementation d...read more
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Q2. Spring bean lifecycle
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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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Q1. Questions on Spring security Questions on Api desgin patterns
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Q2. Questions on kafka interview streaming
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