Optimum Infosystem Senior Java Developer Interview Questions, Process, and Tips

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,
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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. What is oops and its feature
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Object-oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Features of OOP include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation allows objects to hide their internal state and require all interaction to be performed through an object's methods.

• Inheritance allows classes to inherit attributes and methods from other classes.

• Polymorphis...read more
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Q2. Internal working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to fi...read more
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