Pratheek Elevators Interview Questions and Answers

Rotate an array of strings based on given index value

• Create a new array and copy elements starting from the given index to the end

• Copy elements from the start of the original array to the given index to the new array

• Combine the two arrays to get the rotated array

Rest template is used to consume RESTful web services in Spring Boot applications.

• RestTemplate is a class provided by Spring Framework to make RESTful web service calls.

• It simplifies the process of consuming RESTful web services by handling the HTTP requests and responses.

• You can use RestTemplate to make GET, POST, PUT, DELETE requests to RESTful APIs.

• Example: RestTemplate restTemplate = new RestTemplate(); ResponseEntity response = restTemplate.getForEntity(url, String.class...read more

Autowired is a feature in Spring Framework that allows automatic dependency injection.

• Autowired annotation is used to automatically wire beans by type.

• It eliminates the need for explicit bean configuration in XML or Java configuration.

• Autowired can be used on properties, setters, and constructors.

• Example: @Autowired private UserService userService;

Creating REST APIs involves designing endpoints, defining request and response formats, implementing CRUD operations, and handling authentication and authorization.

• Design endpoints based on resource hierarchy and actions (GET, POST, PUT, DELETE)

• Define request and response formats using JSON or XML

• Implement CRUD operations for each endpoint (Create, Read, Update, Delete)

• Handle authentication and authorization using tokens or API keys

• Use frameworks like Express.js for Node.js o...read more

A palindromic string is a string that reads the same forwards and backwards.

• Create a function to check if a string is a palindrome by comparing characters from start and end of the string.

• Examples: 'racecar', 'level', 'madam'