Spring Interview Questions, Study notes of Java Programming

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Spring

Interview Questions

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Covers 200+ Interview Questions about

Spring

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JPA, Sprint Data, Spring Data JPA

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Questions

What is loose coupling?

What is a Dependency?

What is IOC (Inversion of Control)?

What is Dependency Injection?

Can you give few examples of Dependency

Injection?

What is Auto Wiring?

Loose Coupling

@Component public class TodoBusinessService {

@Autowired TodoDataService dataService;// = new TodoDataService()

public TodoBusinessService(TodoDataService dataService) { this.dataService = dataService; }

public interface TodoDataService { List retrieveTodos(String user); }

Loose Coupling

@Component public class ComplexAlgorithmImpl {

@Autowired private SortAlgorithm sortAlgorithm;

public interface SortAlgorithm { public int[] sort(int[] numbers); }

public class QuickSortAlgorithm implements SortAlgorithm {

public class BubbleSortAlgorithm implements SortAlgorithm {

Inversion of Control

public class ComplexAlgorithmImpl {

BubbleSortAlgorithm bubbleSortAlgorithm = new BubbleSortAlgorithm();

@Component public class ComplexAlgorithmImpl {

@Autowired private SortAlgorithm sortAlgorithm;

IOC Container

Find Beans

Wire Dependencies

Manage Lifecycle of the Bean

IOC Container

@Component public class ComplexAlgorithmImpl {

@Autowired private SortAlgorithm sortAlgorithm;

@Component public class QuickSortAlgorithm implements SortAlgorithm {

public interface SortAlgorithm { public int[] sort(int[] numbers); }