DTO vs entity separation benefit in Spring Boot - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a simple DTO class field.

Spring Boot

private [1] name;

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Aint

BString

CEntity

DList

Attempts:

3 left

💡 Hint

Common Mistakes

Using entity class type instead of simple data type.

Using numeric types for text fields.

The DTO field for a name is typically a String to hold text data.

2fill in blank

medium

Complete the code to convert an entity to a DTO in a method.

Spring Boot

return new UserDTO(entity.get[1]());

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AId

BList

CDate

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Using getId() when the DTO expects a name.

Using unrelated getters like getDate().

The method getName() retrieves the name from the entity to pass to the DTO.

3fill in blank

hard

Fix the error in the DTO constructor parameter type.

Spring Boot

public UserDTO([1] name) { this.name = name; }

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AString

BEntity

Cint

DObject

Attempts:

3 left

💡 Hint

Common Mistakes

Using Entity type instead of String.

Using generic Object type.

The constructor should accept a String for the name, not an Entity or other type.

4fill in blank

hard

Fill both blanks to map entity fields to DTO fields correctly.

Spring Boot

dto.setName(entity.get[1]());
dto.setEmail(entity.get[2]());

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AName

BEmail

CId

DDate

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up field names like using getId() instead of getEmail().

Using setters with wrong getter calls.

Mapping entity's getName() and getEmail() to DTO fields ensures data separation.

5fill in blank

hard

Fill all three blanks to create a DTO from entity fields with proper types.

Spring Boot

public record UserDTO([1] name, [2] email, [3] age) {}

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AString

Bint

Dlong

Attempts:

3 left

💡 Hint

Common Mistakes

Using long for age when int is sufficient.

Mixing types between name and email.

UserDTO uses String for name and email, and int for age to keep simple data types.