Infosys Java Developer Interview Questions, Process, and Tips

Q1. Basic spring boot questions
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Q2. Diff btw interface and abstract
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Q1. Agile ,sprints,
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Q2. Details about project
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Q1. Difference between list and set
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List is an ordered collection that allows duplicate elements, while Set is an unordered collection that does not allow duplicates.
• List maintains the insertion order of elements, while Set does not guarantee any specific order.

• List allows duplicate elements, while Set does not allow duplicates.

• Examples of List implementations in Java are ArrayList and LinkedList, while examples of Set implementations are HashSet and Tre
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Q2. Explain about @qualifiers
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Annotations used in Spring to disambiguate beans when multiple beans of the same type are present
• Used in Spring framework to specify which bean to inject when multiple beans of the same type are present

• Can be used with @Autowired or @Resource annotations

• Example: @Qualifier("beanName")
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Q3. Can we use try and finally without catch?
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Yes, try and finally can be used without catch to handle exceptions.
• try block is used to enclose the code that may throw an exception

• finally block is used to execute code regardless of whether an exception is thrown or not

• If catch block is not present, exceptions will not be caught and handled
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Q4. Annotations in @springbootApplication
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Annotations in @SpringBootApplication are used to configure the Spring Boot application.
• Annotations like @SpringBootApplication are used to enable auto-configuration and component scanning in a Spring Boot application.

• Other commonly used annotations include @RestController, @Service, @Repository, and @Component for defining different types of Spring beans.

• Annotations like @Autowired are used for dependency injection in...read more
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Q5. @getmapping vs @postmapping
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The @GetMapping annotation is used to map HTTP GET requests to specific handler methods, while @PostMapping is used for POST requests.
• GetMapping is used for retrieving data from the server, while PostMapping is used for sending data to the server.

• GetMapping is idempotent, meaning it should not have any side effects, while PostMapping can have side effects.

• GetMapping should not be used for operations that modify data, w...read more
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Q6. Features of Java 8
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Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions allow for more concise code and easier parallel programming.

• Streams provide a way to work with sequences of elements and perform operations such as filtering, mapping, and reducing.

• Functional interfaces enable the use of lambda expressions and method references.

• Default methods allo...read more
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Q7. Code in stream api - to find all the numbers less than 10 in a given array list
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Using stream api to find numbers less than 10 in an array list
• Use stream() method on the array list to create a stream of elements

• Use filter() method with a lambda expression to filter out numbers less than 10

• Collect the filtered elements using collect() method to get the result
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Q1. Talked about expected salary
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Q2. Preferred location asked
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Q1. Question on collection framework and java 8, whatever you have written on your cv, question will be asked from that
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Q2. Question related to micro service, maven, git, azure or anything else related to that
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Q1. This was the managerial round in which it mainly focused on what i have worked
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Q2. Question related to my project and how i faced challenges in my previous company
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Q1. Normal salary discussion and negotiation
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Q2. Location discuss
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Q1. Java 8 questions, OOPS,spring
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Q2. Find the smallest element in array using java8
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Q1. Salary discusssion
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Q2. What is your expected CTC
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Q1. Coding question on arrays
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Q2. Core java programming related questions
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Array easy question and string handling and Java 8 based task

Q1. Hash map implementation in java
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap is part of the Java Collections framework.

• It uses hashing to store and retrieve elements quickly.

• Example: HashMap map = new HashMap<>(); map.put("key1", 1); int value = map.get("key1");
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Q2. String manipulation task
Ans. 
Manipulate an array of strings using various string methods.
• Use String methods like substring, replace, toUpperCase, toLowerCase, etc.

• Concatenate strings using '+' operator.

• Split strings into arrays using split method.
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Q1. Basic discussion
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