Response DTO for output in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a simple Response DTO class with a message field.

Spring Boot

public class ResponseDTO {
    private String [1];

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

Drag options to blanks, or click blank then click option'

Aresponse

Bstatus

Cmessage

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different field name than the getter/setter methods.

Forgetting to declare the field.

The field name should be message to match the getter and setter methods.

2fill in blank

medium

Complete the code to add a constructor that sets the message field.

Spring Boot

public ResponseDTO([1] String message) {
    this.message = message;
}

Drag options to blanks, or click blank then click option'

Adouble

Bint

Cboolean

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong data type for the constructor parameter.

Forgetting to assign the parameter to the field.

The constructor parameter type must be String to match the message field type.

3fill in blank

hard

Fix the error in the toString method to correctly return the message.

Spring Boot

@Override
public String toString() {
    return [1];
}

Drag options to blanks, or click blank then click option'

Amessage

BgetMessage()

Cthis.message

D"message"

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the string literal instead of the field value.

Returning the field directly without using getter.

The toString() method should return the message by calling the getter getMessage() to follow good practice.

4fill in blank

hard

Fill both blanks to create a ResponseDTO with a message and return it from a controller method.

Spring Boot

@GetMapping("/hello")
public ResponseDTO sayHello() {
    return new ResponseDTO([1]);
}

// The message to return is [2]

Drag options to blanks, or click blank then click option'

A"Hello, World!"

B"Goodbye"

C"Welcome"

D"Error"

Attempts:

3 left

💡 Hint

Common Mistakes

Using different messages in the code and comment.

Forgetting to put quotes around the string.

The controller returns a new ResponseDTO with the message "Hello, World!".

5fill in blank

hard

Fill all three blanks to create a ResponseDTO with a message, status, and data fields.

Spring Boot

public record ResponseDTO([1] String message, [2] int status, [3] Object data) {}

Drag options to blanks, or click blank then click option'

Afinal

Bprivate

Cpublic

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using private or final which are not valid in record components.

Using static which is not allowed for record components.

In a Java record, the components are implicitly public. Explicitly using public is correct here.