@RequestParam for query strings in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to bind a query string parameter named 'name' to the method parameter.

Spring Boot

public String greet(@[1]("name") String userName) {
    return "Hello, " + userName + "!";
}

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

ARequestParam

BPathVariable

CAutowired

DRequestBody

Attempts:

3 left

💡 Hint

Common Mistakes

Using @PathVariable instead of @RequestParam for query parameters.

Forgetting to specify the parameter name inside the annotation.

The @RequestParam annotation binds a query string parameter to a method parameter in Spring Boot.

2fill in blank

medium

Complete the code to make the 'age' query parameter optional with a default value of 18.

Spring Boot

public String checkAge(@RequestParam(value = "age", required = [1], defaultValue = "18") int age) {
    return "Age is " + age;
}

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

Atrue

Bfalse

Cnull

Doptional

Attempts:

3 left

💡 Hint

Common Mistakes

Setting required to true when the parameter should be optional.

Not providing a defaultValue when required is false.

Setting required = false makes the query parameter optional. If missing, the default value is used.

3fill in blank

hard

Fix the error in the method parameter to correctly bind the 'id' query parameter as a Long.

Spring Boot

public String getUser(@RequestParam("id") [1] userId) {
    return "User ID: " + userId;
}

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

Aint

Bboolean

CString

DLong

Attempts:

3 left

💡 Hint

Common Mistakes

Using primitive int instead of Long for large IDs.

Using String when a numeric type is expected.

The query parameter 'id' should be bound to a Long type to match expected data.

4fill in blank

hard

Fill both blanks to bind two query parameters 'city' and 'country' with default values.

Spring Boot

public String location(@RequestParam(value = "city", defaultValue = [1]) String city, @RequestParam(value = "country", defaultValue = [2]) String country) {
    return city + ", " + country;
}

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

A"Unknown"

B"USA"

C"New York"

D"None"

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around default string values.

Mixing up city and country default values.

Default values are strings and must be quoted. Here, city defaults to "New York" and country to "USA".

5fill in blank

hard

Fill all three blanks to create a method that binds 'page', 'size', and 'sort' query parameters with defaults.

Spring Boot

public String listItems(@RequestParam(value = "page", defaultValue = [1]) int page, @RequestParam(value = "size", defaultValue = [2]) int size, @RequestParam(value = "sort", defaultValue = [3]) String sort) {
    return "Page: " + page + ", Size: " + size + ", Sort by: " + sort;
}

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

A"name"

B"id"

C"10"

D"1"

Attempts:

3 left

💡 Hint

Common Mistakes

Quoting numeric default values.

Using wrong default values for parameters.

Default values for page and size are numbers (1 and 10), and sort is a string ("id"). Numbers do not need quotes.