1. Spring Dependency Injection (Book Recommendation Service)

Task:

• Implement a book recommendation service where BookRepository should be injected into RecommendationService using Spring dependency injection.
• Missing annotations should be added so that RecommendationService and BookRepository are recognized as Spring beans and Spring injects BookRepository properly.

Code Snippet Example:

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2. Spring MVC: Appointment Controller (Multiple Choice Question)

Question:

Based on the provided code, select the correct statements (select all that apply):

Code Snippet:

Options:

• A. Calling createAppointment() will result in an error as the @RequestBody annotation can only be used with either a String or primitive types.
• B. createAppointment() will be called only if a user submits an HTTP POST request to /appointments/create.
• C. Values returned to the client by @ResponseBody methods are automatically mapped to a specific data format (e.g. XML, JSON) depending on Spring's configuration and the accept HTTP header.
• D. listAppointments() will be called when a user visits /appointments/get.
• E. The content served by listAppointments() will be returned with the HTTP header "Content-Type: text/plain".

Correct Answers:

• B: createAppointment() will be called only if a user submits an HTTP POST request to /appointments/create.
• C: Values returned to the client by @ResponseBody methods are automatically mapped to a specific data format (e.g. XML, JSON) depending on Spring's configuration and the accept HTTP header.

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3. Algorithm: findMaxSum Method

Task:

• Implement the findMaxSum method that, efficiently with respect to time, returns the largest sum of any two elements in the given list of positive numbers.

Example:

For example, the largest sum of the list { 5, 9, 7, 11 } is the sum of the elements 9 and 11, which is 20.

Code Snippet:

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4. JUnit Test Cases: Shelf Class

Task:

• Write unit tests using JUnit 4's Assert class for a Shelf class.
• The tests should cover the following scenarios:
  • The put method will do nothing when passed null. It should also do nothing when passed an empty string.
  • Each individual item can only be taken from the shelf once.
  • Duplicate items can exist on the shelf at the same time.

Code Snippet:

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