Birlasoft Fullstack Java Application Developer Interview Questions and Answers

Find duplicate element frequency in an array of strings.

• Create a HashMap to store each element and its frequency.

• Iterate through the array and update the frequency in the HashMap.

• Print out elements with frequency greater than 1.

Stream API in Java provides a way to process collections of objects in a functional style.

• Stream API allows for easy manipulation of collections using functional programming concepts like map, filter, and reduce.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Stream<String> stream = names.stream();

• Example: List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); int sum = numbers.

Dependency Injection in Spring is a design pattern where objects are provided with their dependencies rather than creating them.

• In Spring, Dependency Injection is achieved through either constructor injection or setter injection.

• It helps in achieving loose coupling between classes and makes the code more maintainable and testable.

• Example: @Autowired annotation in Spring is used for dependency injection.