Infor Global Solution Software Java Engineer Interview Questions and Answers

Q1. Singliton class
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Q2. Immutable class
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Q3. Most occured letter in string ? Problem to code
Ans. 
Find the most occurred letter in a given string.
• Iterate through the string and count the occurrences of each letter

• Store the counts in a map or array

• Find the letter with the highest count
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Q4. Global exception handler ?
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Q5. Design principle?
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Design principle is a set of guidelines that help software developers create maintainable and scalable code.
• Design principles help in creating code that is easy to understand, modify, and maintain.

• Examples of design principles include SOLID principles, DRY (Don't Repeat Yourself), KISS (Keep It Simple, Stupid), and YAGNI (You Aren't Gonna Need It).
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Q1. Design patterns
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Q2. OOPS Concept
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Java Coding Questions based on ArrayList, HashMap, etc.

Count distinct elements in given String.

Q1. Current Project architecture.
Ans. 
Our current project architecture follows a microservices design pattern with separate services for different functionalities.
• Microservices architecture with separate services for different functionalities

• Use of RESTful APIs for communication between services

• Containerization using Docker for easy deployment and scalability

• Implementation of service discovery and load balancing with tools like Kubernetes

• Use of message bro
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Q2. My role in project
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My role in the project was to develop and maintain Java applications to meet the project requirements.
• Developing Java applications based on project requirements

• Maintaining and updating existing Java code

• Collaborating with team members to ensure project success
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Q1. Dsa question, I don’t remember
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Q2. Check if the sentence is palindrome or not
Ans. 
To check if a sentence is a palindrome, compare it with its reverse form.
• Remove all non-alphanumeric characters and convert the sentence to lowercase.

• Reverse the sentence and compare it with the original sentence to check for palindrome.

• Example: 'A man, a plan, a canal, Panama' becomes 'amanaplanacanalpanama' after removing non-alphanumeric characters and converting to lowercase.
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Q1. Discussion was on Binary tree and tree traversal. Asked me to write binary tree complete program to insert amd traversal of binary tree with few changes on how to insert.
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Q2. In depth discussion on my experience my projects.
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Q1. Java, sql ,springboot
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Q1. Basic Java and SQL query
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Reverse string code and reverse array code

Q1. Basic of java, pillar of oops, collection, exception handling etc.
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Q2. What isinheritance
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Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit properties like 'speed' and methods like 'drive()'
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Q3. What is encapsulation
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Encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct modification from outside the class.

• Access to the data is provided through methods, which can enforce validation rules and ensure data integrity.

• Ex...read more
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Q4. What is polymorphism
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Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with Dog and Cat subclasses. Both Dog and Cat can be treated as Animals.
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Q5. What is abstraction
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Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the user.
• Abstraction allows developers to focus on what an object does rather than how it does it

• It helps in reducing complexity and improving code readability

• Example: In Java, abstract classes and interfaces are used to achieve abstraction
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Q1. Easy Questions - Oops Concept . real life examples Abstract Class Inheritance difference Final vs immutable Spring Concepts - dependency injection,about @autowired
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Q1. English Test - Speaking Fluent Eglish
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