Builder pattern for test data in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start building a User object using the builder pattern.

JUnit

User user = User.[1]();

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

Abuilder

Bnew

Ccreate

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' instead of 'builder()' to start the builder.

Using 'build()' which is used to finish building, not start.

The builder pattern usually starts with a static method named builder() to create a builder instance.

2fill in blank

medium

Complete the code to set the user's name in the builder.

JUnit

User user = User.builder().[1]("Alice").build();

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

AuserName

BsetName

CwithName

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setName' which is common in setters but not in builders.

Using 'withName' which is sometimes used but not here.

In builder patterns, the setter methods usually have the same name as the field, here name().

3fill in blank

hard

Fix the error in the builder usage to correctly set the user's age.

JUnit

User user = User.builder().age[1]30).build();

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

A=

B(

C.

D->

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' which is an assignment, not a method call.

Using '.' without parentheses which causes syntax error.

Method calls require parentheses, so age(30) is correct.

4fill in blank

hard

Fill both blanks to build a User with email and then finish building.

JUnit

User user = User.builder().[1]("[e-mail]").[2]();

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

Aemail

Bbuild

CsetEmail

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setEmail' which is not typical in builder patterns.

Using 'create' which is not the method to finish building.

The builder method to set email is email(), and build() finishes the building process.

5fill in blank

hard

Fill all three blanks to build a User with name, age, and then finish building.

JUnit

User user = User.builder().[1]("Bob").[2](25).[3]();

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

Aname

Bage

Cbuild

DsetAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setAge' instead of 'age' for the builder method.

Forgetting to call 'build()' at the end.

Use name() to set the name, age() to set the age, and build() to finish building.