Infosys Java Developer Interview Questions, Process, and Tips

Demonstrate the flow of Spring MVC through code

• Create a controller class with request mapping annotations

• Define methods in the controller to handle different requests

• Configure the dispatcher servlet in web.xml

• Create a view resolver to map logical view names to actual views

Use stream api to find duplicates in an array of strings

• Convert array to stream using Arrays.stream()

• Use Collectors.groupingBy() to group elements by their occurrences

• Filter the map to find elements with count > 1

Move all zeroes in an array to the end without changing the order of other elements.

• Iterate through the array and keep track of the index where non-zero elements should be placed.

• After the iteration, fill the remaining positions with zeroes.

Check if 2 strings are anagrams by comparing sorted characters

• Sort the characters of both strings and compare if they are equal

• Use a hashmap to store character frequencies and compare the maps

To check logs in an app, access log files or use logging frameworks like Log4j.

• Access log files directly in the application directory

• Use logging frameworks like Log4j to log messages at different levels

• Analyze log files for errors or debugging information

Prioritize tasks, break down work into smaller chunks, communicate with team, utilize time management techniques

• Prioritize tasks based on importance and urgency

• Break down work into smaller, manageable chunks to make progress

• Communicate with team members to ensure everyone is on the same page

• Utilize time management techniques such as Pomodoro technique or Agile methodologies

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

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")

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

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

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

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

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