Patterns 2020/4/12 Structural Design Patterns Creational - - PowerPoint PPT Presentation

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Patterns 2020/4/12 Structural Design Patterns Creational - - PowerPoint PPT Presentation

Apr 08, 2024 625 likes •931 views

Poly- mor- phism Abstra ction Class OOP Inheri -tance En- capsu- lation Structural Design Kuan-Ting Lai Patterns 2020/4/12 Structural Design Patterns Creational Structural Behavioral Design Patterns Design Patterns Design

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SLIDE 1

Structural Design Patterns

Kuan-Ting Lai 2020/4/12

OOP

Class Abstra ction Inheri

  • tance

En- capsu- lation Poly- mor- phism

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SLIDE 2

Structural Design Patterns

Creational Design Patterns

Initialize objects

  • r create new

classes

Structural Design Patterns

Compose

  • bjects to get

new functions

Behavioral Design Patterns

Communication between objects

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SLIDE 3

Structural Design Patterns

  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Façade
  • Flyweight
  • Proxy
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Adapter Pattern

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Adapter

  • Adapter works as a bridge between

two incompatible interfaces

  • Object adaptor
  • Class adaptor
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Inheritance vs. Composition

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Object Adaptor

  • Client Interface describes a protocol that other classes must follow
  • Adapter is a class that implements the client interface and composite

a service object

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Class Adaptor

  • Inherit from both client and service class
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Example: MediaPlayer

https://www.tutorialspoint.com/design_pattern/adapter_pattern.htm

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Bridge Pattern

  • Split a large class into two separate hierarchies: abstraction and

implementation

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Bridge Example: Colorful Shapes

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Separating Shape and Color

  • The Bridge pattern attempts to solve this problem by switching from

inheritance to composition

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Using Composition to Implement New Function

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Composite Pattern

  • Compose objects into

a tree structure

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Document Structure

  • Recursive composition of text and graphics
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Composite Pattern

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Composite Structure

  • Component

interface describes

  • perations that are common to

both simple and complex elements

  • f the tree
  • Leaf is a basic element without

sub-elements

  • Container (aka composite) is an

element that has sub-elements

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Decorator

  • Attach new behaviors to objects by placing these objects
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Embellishing the User Interface (Decorator)

  • Decorator Pattern: support embellishment by

transparent enclosure

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FACADE

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FACADE

  • Define a new interface for existing many objects
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FLYWEIGHT

  • Fit more objects into RAM by sharing common

parts of state between multiple objects

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Example: Game Displaying

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Proxy

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Proxy Structure

  • Lazy initialization
  • Access control
  • Local execution of a remote

service

  • Logging requests
  • Caching results
  • Garbage collection
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SLIDE 29

Example: Internet Proxy

https://www.javatpoint.com/proxy-pattern

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References

  • Alexander Shvets, “Dive into Design Patterns,” 2018
  • https://www.tutorialspoint.com/design_pattern/index.htm
  • https://www.javatpoint.com/design-patterns-in-java
  • https://www.startertutorials.com/patterns/select-design-

pattern.html