Infosys Java Developer Interview Questions, Process, and Tips

Q1. Explain Funcational Intergace.
Ans. 
Functional Interface is an interface with only one abstract method, used for lambda expressions.
• Functional Interface can have multiple default or static methods.

• Examples include Runnable, Callable, Comparator interfaces.

• Used for lambda expressions to provide implementation for the single abstract method.
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Oops, azure, spring boot, microservices, rest services.

Q1. Project questions
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Q1. Basic questions
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Q1. Java 8 features
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Q2. Lambda function
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Q1. Spring boot basic
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Q2. Spring security, Java
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Q1. Java 8 question were asked
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Q2. Basic dsa questions were asked
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Q1. Azure Devops questions were asked
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Q2. Java 8 questions were asked
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Q1. Technical questions on my project were asked
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Q2. Springboot, Hibernate Microservices Spring security questions were asked
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Q1. What is oops conecpts and give example?
Ans. 
OOPs concepts refer to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behaviors from another class. Example: class Dog extends Animal.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: private variables with public getter and setter methods.

• Polymorphism: Ability to pre...read more
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Q2. Diffrenece between interafce and abstract class
Ans. 
Interface is a blueprint for classes to implement, while abstract class can have both abstract and concrete methods.
• Interface can only have abstract methods and constants, while abstract class can have abstract and concrete methods.

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

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have instance variables, con...read more
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Q3. What is collection and collections, what is collection framework?
Ans. 
Collection is a group of objects, Collections is a utility class, Collection framework is a set of interfaces and classes for handling collections.
• Collection is an interface in Java that represents a group of objects known as elements.

• Collections is a utility class in Java that contains static methods for operating on collections.

• Collection framework is a set of interfaces and classes in Java that provides an architect...read more
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Q4. Have you worked on spring security then explain ?
Ans. 
Yes, I have worked on Spring Security. It is a powerful and customizable authentication and access control framework for Java applications.
• Implemented authentication and authorization using Spring Security annotations like @Secured, @PreAuthorize, @PostAuthorize

• Configured security settings in XML or Java configuration files

• Used Spring Security filters for protecting URLs, CSRF protection, session management, etc.

• Integr...read more
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Q5. What is microservices ,how its works
Ans. 
Microservices are a software development technique where an application is composed of small, independent services that communicate with each other.
• Microservices break down a large application into smaller, loosely coupled services

• Each service is responsible for a specific function and can be developed, deployed, and scaled independently

• Communication between services is typically done through APIs or messaging queues

• Mi...read more
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Q6. Sql joins , write query for second highest salary, java 8 stream api, program for even odd number in java 8
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Q1. Prerequisites: Payment gateway If your order fails and payment has been deducted, how do you manage this situation.
Ans. 
In case of order failure with payment deducted, refund the payment and investigate the issue.
• Initiate refund process for the deducted payment

• Investigate the reason for the order failure

• Communicate with the customer about the issue and resolution

• Ensure the payment gateway is functioning correctly to prevent future occurrences
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Q2. What are constructors and its types
Ans. 
Constructors are special methods used to initialize objects in Java.
• Constructors have the same name as the class and do not have a return type.

• Types of constructors include default constructor, parameterized constructor, and copy constructor.

• Default constructor is provided by Java if no constructor is defined.

• Parameterized constructor takes parameters to initialize an object with specific values.

• Copy constructor create...read more
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