Infosys Java Developer Interview Questions and Answers for Experienced

Q1. What are @annotations in springboot? explain about @springBootApplication
Ans. 
Annotations in Spring Boot are used to provide metadata about the code. @SpringBootApplication is a meta-annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan.
• Annotations in Spring Boot are used to simplify configuration and reduce boilerplate code.

• @SpringBootApplication is a meta-annotation that enables the auto-configuration feature in Spring Boot.

• It combines @Configuration, @EnableAut...read more
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Q1. WHAT IS OOPS
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Q2. How to define custom sorting logic
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Q3. Describe about functional interface
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Q4. Important features of Java 8
Ans. 
Java 8 introduced significant features like lambdas, streams, and the new date/time API, enhancing productivity and code readability.
• Lambda Expressions: Allow you to write concise and expressive code by enabling you to treat functionality as a method argument. Example: (a, b) -> a + b.

• Streams API: Provides a powerful way to process sequences of elements, enabling functional-style operations on collections. Example: ...read more
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Q1. Java 8 related questions with some basic coding using java 8.
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Q2. Print some thing java 8 lambda expression
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Q1. Project related questions and some coding questions
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Q1. Work Details, education details
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Q1. What is Functional Interface? What is Flat Map? What is Method Reference? What is stream API
Ans. 
Functional Interface is an interface with only one abstract method. Flat Map is used to flatten nested collections. Method Reference is a shorthand notation for lambda expressions. Stream API is used to process collections of objects.
• Functional Interface is an interface with a single abstract method, such as Runnable or Comparator.

• Flat Map is a method in Java that is used to flatten nested collections, like List<Lis...read more
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Q2. What is Flat Map
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Q3. What is Stream API
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Q4. How you handle logs in previous company
Ans. 
In my previous company, I implemented structured logging and centralized log management for better monitoring and debugging.
• Utilized SLF4J with Logback for logging, allowing for flexible configuration and log formatting.

• Implemented log levels (INFO, DEBUG, ERROR) to control the verbosity of logs based on the environment.

• Set up centralized logging using ELK stack (Elasticsearch, Logstash, Kibana) for real-time log analy...read more
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Q5. What is functional interface
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Q1. How can you write custom exception in Java?
Ans. 
To write a custom exception in Java, create a new class that extends Exception or a subclass of Exception.
• Create a new class that extends Exception or a subclass of Exception.

• Add a constructor to the custom exception class to pass a message to the superclass constructor.

• Throw the custom exception using the 'throw' keyword in your code.

• Handle the custom exception using try-catch blocks or propagate it up the call stack.
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Q2. Explain internal working of HashMap
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Coding test time duration was 45 mins. Question was related to string array checking the good arrray on condition of no occurrence of characters.