UML class diagrams basics in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a class with a name in UML notation.

LLD

class [1] {
}

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

APerson

Battribute

Cmethod

Dinterface

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'attribute' or 'method' as the class name.

The class name goes inside the class box in UML diagrams.

2fill in blank

medium

Complete the code to add an attribute to a UML class with visibility.

LLD

class Person {
  [1] name: String
}

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

A-

B~

C#

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which means private, not public.

In UML, '+' means the attribute is public (visible outside the class).

3fill in blank

hard

Fix the error in the UML method declaration by choosing the correct return type symbol.

LLD

class Person {
  + getAge() : [1]
}

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

Avoid

Bint

CString

Dboolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' which means no return value.

The method getAge() should return an integer representing age.

4fill in blank

hard

Fill both blanks to show correct UML notation for a private attribute and a public method.

LLD

class Car {
  [1] speed: int
  [2] accelerate()
}

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

A-

B+

C#

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' for attributes which should be private.

Private attributes use '-', public methods use '+'.

5fill in blank

hard

Fill all three blanks to complete the UML class with an attribute, method, and return type.

LLD

class Book {
  [1] title: String
  [2] getTitle() : [3]
}

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

A+

CString

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Making the attribute public or returning wrong type.

The attribute 'title' is private ('-'), the method 'getTitle()' is public ('+'), and returns a String.