Use case diagrams in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to name the main actor in a use case diagram.

LLD

actor [1]

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

AUser

BSystem

CDatabase

DServer

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing system components like Server or Database as actors.

The main actor in a use case diagram is usually the User who interacts with the system.

2fill in blank

medium

Complete the code to define a use case named 'Login'.

LLD

usecase [1] as "Login"

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

AStart

BLogin

CUserLogin

DUC1

Attempts:

3 left

💡 Hint

Common Mistakes

Using the descriptive name as the identifier.

Use cases are often labeled with identifiers like UC1 and given descriptive names.

3fill in blank

hard

Fix the error in the association between actor and use case.

LLD

actor User
usecase UC1 as "Login"
User [1] UC1

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

A--

B<->

C-->

D->

Attempts:

3 left

💡 Hint

Common Mistakes

Using arrows which imply direction.

In use case diagrams, associations between actors and use cases are shown with a simple line --.

4fill in blank

hard

Fill both blanks to show an include relationship from 'Register' to 'Validate User'.

LLD

usecase Register as "Register"
usecase ValidateUser as "Validate User"
Register [1] ValidateUser [2]

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

A<|--

B--

C<|..

D..>

Attempts:

3 left

💡 Hint

Common Mistakes

Using solid lines or wrong arrowheads for include.

The include relationship is shown with a dashed arrow <|.. pointing to the included use case.

5fill in blank

hard

Fill all three blanks to define an extend relationship from 'Make Payment' to 'Apply Discount' with condition '[if eligible]'.

LLD

usecase MakePayment as "Make Payment"
usecase ApplyDiscount as "Apply Discount"
MakePayment [1] ApplyDiscount [2] : [3]

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

A<|..

B..>

C[if eligible]

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing include and extend arrows or missing the condition label.

The extend relationship uses a dashed arrow <|.. with a label showing the condition in square brackets.