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
Ans. 
Using Java 8, we can find the smallest element in an array of strings by using the Stream API and the min() method.
• Convert the array of strings to a Stream using Arrays.stream()

• Use the min() method with a Comparator to find the smallest element

• Return the smallest element found
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Q1. Salary discusssion
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Q2. What is your expected CTC
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My expected CTC is based on my experience, skills, and the market rate for Java Developers.
• My expected CTC is in line with industry standards for Java Developers.

• I have considered my years of experience and expertise in Java development when determining my expected CTC.

• I am open to negotiation based on the overall compensation package offered by the company.
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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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