This OOP Online Test
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About the test
The object oriented programming online test assesses candidates' knowledge of OOP concepts such as polymorphism, inheritance, abstraction, encapsulation, and design patterns.
It's an ideal test for pre-employment screening. A good software engineer who uses a modern OOP language needs to understand core concepts of the OOP language and how to use design patterns to write reusable solutions that other developers can understand.
This online test requires candidates to answer questions about object oriented programming concepts and design patterns.
Sample public questions
Your team has started to write software for managing a vehicle storehouse using a programming language that supports OOP. This is the class hierarchy you plan to use:
class Vehicle class Car inherits Vehicle class Bicycle inherits Vehicle class MountainBike inherits Bicycle class Downhill inherits MountainBike
Objects of which type can be assigned to a variable of type Bicycle?
In a language that supports the OOP paradigm, we have the following code that serializes the content of a shopping cart to JSON format:
class ShoppingCart private content : Dictionary<Int, String> public function serialize() : String return new JsonSerializer().serialize(content.clone()) end function end class class JsonSerializer public function serialize(value : Dictionary<Int, String>) : String // Code that serializes dictionary to JSON format and returns it as string end function end class
A client wants to allow loosely coupled plugins to be able to serialize the shopping cart content to their own formats (e.g., XML). Select lines of code that, together, would extend the code above to allow this.
A word processor uses the following code for defining font format:
class FontFormat inherits Object private fontName : String private fontSize : Int public constructor(name : String, size : Int) fontName = name fontSize = size end constructor public function getFontName() : String return fontName end function public function getFontSize() : Int return fontSize end function override public function equals(obj : Object) : Bool if (!(obj instanceof FontFormat)) return false end if FontFormat f = (FontFormat)obj return f.getFontName() == fontName && f.getFontSize() == fontSize end function override public function getHashCode() : Int return fontName.getHashCode() ^ fontSize.getHashCode() end function end class
Analysis shows that even the largest documents use fewer than a hundred different combinations of font name and size. The same analysis shows that the application sometimes uses thousands of FontFormat objects, most of which share the same font name and size.
(Fill in the blank with the software design pattern that solves the issue.)
The ____________ software design pattern can be used to minimize the memory footprint by sharing FontFormat objects.
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Skills and topics tested
- OOP & Design Patterns
- Behavioral Patterns
- Creational Patterns
- Design Patterns
- Method Overriding
- Inversion of Control
For job roles
- Back-End Developer
- Full-Stack Developer
- Mobile Developer
- Software Developer
- Web Developer
Sample candidate report
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