We have prepared a presentation on design pattern. Here are 7 types of design pattern we have presented.
1. Mediator Design
2. Iterator Pattern
3. Bridge Pattern
4. Decorator Pattern
5. Composite Pattern
6. Template Pattern
7. Singleton Pattern
Here is the link of Canva Slide to use as template----
https://www.canva.com/design/DAEmun8Sjks/NmH08MOYrAWSaTERNbe5LA/view?utm_content=DAEmun8Sjks&utm_campaign=designshare&utm_medium=link&utm_source=sharebutton&mode=preview
You can contact me in LinkedIn or any other social platform for more infromation.
Thank you.
NicheTech is a fastest growing IT company working on .Net Projects for offshore clients across the globe for over 18 countries.
We have expertise in MVC and SQL server based complex business projects.
C# developers are the best assets for us.
ASP.net development in india is the best option and NicheTech is the best available option for you.
Website : http://www.nichetechsolutions.com/ASP.net-MVC-Developers
Facebook: https://www.facebook.com/NicheTech
Twitter : https://twitter.com/nichetechsol
Master student 20-30 minute internship presentation, agenda, introduction of company, working & learning journey map, work journey in brief(skip), small project/module video, screenshots of recent project, supporter introduction.
ABOUT COMPANY
OUR COMPANY’S EXPERTISE TECHNOLOGIES
WORKING ENVIRONMENT
WHICH TECHNOLOGIES I EXPLORED DURING IDP
DURING INTERNSHIP WORK JOURNEY
SCREENSHOTS
SUPPORTER
NicheTech is a fastest growing IT company working on .Net Projects for offshore clients across the globe for over 18 countries.
We have expertise in MVC and SQL server based complex business projects.
C# developers are the best assets for us.
ASP.net development in india is the best option and NicheTech is the best available option for you.
Website : http://www.nichetechsolutions.com/ASP.net-MVC-Developers
Facebook: https://www.facebook.com/NicheTech
Twitter : https://twitter.com/nichetechsol
Master student 20-30 minute internship presentation, agenda, introduction of company, working & learning journey map, work journey in brief(skip), small project/module video, screenshots of recent project, supporter introduction.
ABOUT COMPANY
OUR COMPANY’S EXPERTISE TECHNOLOGIES
WORKING ENVIRONMENT
WHICH TECHNOLOGIES I EXPLORED DURING IDP
DURING INTERNSHIP WORK JOURNEY
SCREENSHOTS
SUPPORTER
Webinar on Design Patterns titled 'Dive into Design Patterns'Edureka!
Object Oriented Programming is one of the biggest evolution ever happened to the software industry. Lots of languages started implementing OOP concepts thinking it would add lot of value and will improve the adaptability of the languages. While the OOP provides the concepts, programming languages still lack the essence that is needed for better software design. Design patterns fill the gap by providing solution templates for commonly occurring design problems. As any other software entity, Design Patterns is an evolving subject and it has reached its extreme maturity now by covering most of the design problems that the current software industry is facing. Practicing design patterns has helped the success ratio of software projects these days immensely. Design patterns have become a magic wand in the hands of successful software programmers and architects. The topics covered in the presentation are:
1.Know what is Software Design Patterns
2.Understand the need of Software Design Patterns
3.Code with Adapter Settings
4.Communicate among objects with Mediator Patterns
5.Distribute responsibility using Chain of Responsibility Patterns
6.Decorate your objects with Decorator Patterns
As my resume reveals, I have both a Bachelors and Master's degree in Computer application.I have 7.5 year experience in ASP.NET2.0/3.5/4.0/sqlserver2000/2005/2008/C# /MVC4/WCF/Jquery and currently working in Fareportal India Pvt. Ltd as Senior Software Engineer
I have enclosed my resume for your review. I would like the opportunity to meet and share more about my qualifications and the ways in which I can contribute to the team. Thank you for considering my request
I have 2.5 years of experience in Core Java and data structurealgorithm and Oracle Database technologies, Worked with Amdocs DVCI in Amdocs CRM Product.
For more course tutorials visit
www.newtonhelp.com
POS 408 Assignment Week 1 Individual Console Display Message
POS 408 Assignment Week 2 Learning Team Methods Can Help with Maintenance
Presented at jDD Krakow Oct 2017
Developers love to complain about their legacy systems, but if you have a legacy system, it means you have a working, successful system which deliver real value to business, and this is definitely a good thing.
Webinar on Design Patterns titled 'Dive into Design Patterns'Edureka!
Object Oriented Programming is one of the biggest evolution ever happened to the software industry. Lots of languages started implementing OOP concepts thinking it would add lot of value and will improve the adaptability of the languages. While the OOP provides the concepts, programming languages still lack the essence that is needed for better software design. Design patterns fill the gap by providing solution templates for commonly occurring design problems. As any other software entity, Design Patterns is an evolving subject and it has reached its extreme maturity now by covering most of the design problems that the current software industry is facing. Practicing design patterns has helped the success ratio of software projects these days immensely. Design patterns have become a magic wand in the hands of successful software programmers and architects. The topics covered in the presentation are:
1.Know what is Software Design Patterns
2.Understand the need of Software Design Patterns
3.Code with Adapter Settings
4.Communicate among objects with Mediator Patterns
5.Distribute responsibility using Chain of Responsibility Patterns
6.Decorate your objects with Decorator Patterns
As my resume reveals, I have both a Bachelors and Master's degree in Computer application.I have 7.5 year experience in ASP.NET2.0/3.5/4.0/sqlserver2000/2005/2008/C# /MVC4/WCF/Jquery and currently working in Fareportal India Pvt. Ltd as Senior Software Engineer
I have enclosed my resume for your review. I would like the opportunity to meet and share more about my qualifications and the ways in which I can contribute to the team. Thank you for considering my request
I have 2.5 years of experience in Core Java and data structurealgorithm and Oracle Database technologies, Worked with Amdocs DVCI in Amdocs CRM Product.
For more course tutorials visit
www.newtonhelp.com
POS 408 Assignment Week 1 Individual Console Display Message
POS 408 Assignment Week 2 Learning Team Methods Can Help with Maintenance
Presented at jDD Krakow Oct 2017
Developers love to complain about their legacy systems, but if you have a legacy system, it means you have a working, successful system which deliver real value to business, and this is definitely a good thing.
Video and slides synchronized, mp3 and slide download available at URL http://bit.ly/1VoUxQr.
Rachel Reese talks about Jet.com's chaos testing methods and code in depth, but also lays out a path to implementation that everyone can use. Filmed at qconlondon.com.
Rachel Reese is a long-time software engineer and math geek. She currently helps run the Nashville F# User group, NashFSharp, and previously ran the Burlington, VT functional programming user group, VTFun. She's also an ASPInsider, an F# MVP, a community enthusiast, one of the founding lambdaladies, and a Rachii.
Presented at JavaZone (10th September 2014)
Video available at https://vimeo.com/105758303
But how much reason supports the rituals and mantras often repeated as coding guidelines? It turns out that the advice often fails, even for the novices they are intended to guide. Let's reason through these rather than accept them as unquestioned habits.
How many asserts should a test case have or not have? How much work should a constructor (not) do? What mantra guides test-first programming? How do you name your classes and other identifiers? How do you lay out your code? These questions and others have standard answers based on received and repeated mantras, practices that are communicated in good faith to be passed on as habits. But how much reason supports these assertions? It turns out that the advice often fails, even for the novices they are intended to guide.
This talk has little respect for ritual and tradition and takes no prisoners: What actually makes sense and what doesn't when it comes to matters of practice? What guidelines offer the greatest effect and the greatest learning?
How much do we know about Object-Oriented Programming?Sandro Mancuso
This talk goes through many of the Object-Oriented Programming principles and characteristics. Things that all developers should have in mind while writing code.
Esta charla comprende las lecciones aprendidas convirtiendo la app de Android de Teambox (una app repleta de deuda técnica y con un alto nivel de acoplamiento entre clases), en la versión actual de Redbooth, que intenta cumplir la arquitectura Hexagonal y los principios SOLID. Durante la exposición explicaremos como fuimos desenredando el código paso a paso; como aplicamos por partes los conceptos de la arquitectura hexagonal; como dejamos de lado componentes del framework de Android que dificultaban el mantenimiento de la app; y que errores cometimos, como los solucionamos y como se podrían haber evitado.
SOCRadar Research Team: Latest Activities of IntelBrokerSOCRadar
The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
Innovating Inference - Remote Triggering of Large Language Models on HPC Clus...Globus
Large Language Models (LLMs) are currently the center of attention in the tech world, particularly for their potential to advance research. In this presentation, we'll explore a straightforward and effective method for quickly initiating inference runs on supercomputers using the vLLM tool with Globus Compute, specifically on the Polaris system at ALCF. We'll begin by briefly discussing the popularity and applications of LLMs in various fields. Following this, we will introduce the vLLM tool, and explain how it integrates with Globus Compute to efficiently manage LLM operations on Polaris. Attendees will learn the practical aspects of setting up and remotely triggering LLMs from local machines, focusing on ease of use and efficiency. This talk is ideal for researchers and practitioners looking to leverage the power of LLMs in their work, offering a clear guide to harnessing supercomputing resources for quick and effective LLM inference.
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I ...Juraj Vysvader
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How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
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Tim Combridge from Sensible Giraffe and Salesforce Ben presents some important tips that all developers should know when dealing with Flows in Salesforce.
Prosigns: Transforming Business with Tailored Technology SolutionsProsigns
Unlocking Business Potential: Tailored Technology Solutions by Prosigns
Discover how Prosigns, a leading technology solutions provider, partners with businesses to drive innovation and success. Our presentation showcases our comprehensive range of services, including custom software development, web and mobile app development, AI & ML solutions, blockchain integration, DevOps services, and Microsoft Dynamics 365 support.
Custom Software Development: Prosigns specializes in creating bespoke software solutions that cater to your unique business needs. Our team of experts works closely with you to understand your requirements and deliver tailor-made software that enhances efficiency and drives growth.
Web and Mobile App Development: From responsive websites to intuitive mobile applications, Prosigns develops cutting-edge solutions that engage users and deliver seamless experiences across devices.
AI & ML Solutions: Harnessing the power of Artificial Intelligence and Machine Learning, Prosigns provides smart solutions that automate processes, provide valuable insights, and drive informed decision-making.
Blockchain Integration: Prosigns offers comprehensive blockchain solutions, including development, integration, and consulting services, enabling businesses to leverage blockchain technology for enhanced security, transparency, and efficiency.
DevOps Services: Prosigns' DevOps services streamline development and operations processes, ensuring faster and more reliable software delivery through automation and continuous integration.
Microsoft Dynamics 365 Support: Prosigns provides comprehensive support and maintenance services for Microsoft Dynamics 365, ensuring your system is always up-to-date, secure, and running smoothly.
Learn how our collaborative approach and dedication to excellence help businesses achieve their goals and stay ahead in today's digital landscape. From concept to deployment, Prosigns is your trusted partner for transforming ideas into reality and unlocking the full potential of your business.
Join us on a journey of innovation and growth. Let's partner for success with Prosigns.
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Drawing on a real-life project from the HR industry, the various challenges will be demonstrated: data protection, self-healing, business continuity, security, and transparency of data processing. This systematized approach allowed to create a secure AWS cloud infrastructure that not only met strict compliance rules but also exceeded the client's expectations.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
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We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
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Your Digital Assistant.
Making complex approach simple. Straightforward process saves time. No more waiting to connect with people that matter to you. Safety first is not a cliché - Securely protect information in cloud storage to prevent any third party from accessing data.
Would you rather make your visitors feel burdened by making them wait? Or choose VizMan for a stress-free experience? VizMan is an automated visitor management system that works for any industries not limited to factories, societies, government institutes, and warehouses. A new age contactless way of logging information of visitors, employees, packages, and vehicles. VizMan is a digital logbook so it deters unnecessary use of paper or space since there is no requirement of bundles of registers that is left to collect dust in a corner of a room. Visitor’s essential details, helps in scheduling meetings for visitors and employees, and assists in supervising the attendance of the employees. With VizMan, visitors don’t need to wait for hours in long queues. VizMan handles visitors with the value they deserve because we know time is important to you.
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One app for all industries – a Visitor Management System that works for any organisation.
Stress-free Sign-up
Visitor is registered and checked-in by the Receptionist
Host gets a notification, where they opt to Approve the meeting
Host notifies the Receptionist of the end of the meeting
Visitor is checked-out by the Receptionist
Host enters notes and remarks of the meeting
Customizable Components
Scheduling Meetings – Host can invite visitors for meetings and also approve, reject and reschedule meetings
Single/Bulk invites – Invitations can be sent individually to a visitor or collectively to many visitors
VIP Visitors – Additional security of data for VIP visitors to avoid misuse of information
Courier Management – Keeps a check on deliveries like commodities being delivered in and out of establishments
Alerts & Notifications – Get notified on SMS, email, and application
Parking Management – Manage availability of parking space
Individual log-in – Every user has their own log-in id
Visitor/Meeting Analytics – Evaluate notes and remarks of the meeting stored in the system
Visitor Management System is a secure and user friendly database manager that records, filters, tracks the visitors to your organization.
"Secure Your Premises with VizMan (VMS) – Get It Now"
2. What is Design Pattern?
A D E S I G N P A T T E R N I S A G E N E R A L R E U S A B L E
S O L U T I O N T O A C O M M O N L Y O C C U R R I N G P R O B L E M
I N S O F T W A R E D E S I G N .
5. The Mediator defines the interface for
communication between objects. This is a
behavioural pattern as it defines a manner for
controlling communication between classes or
entities. The mediator pattern is used to reduce
coupling between classes that communicate with
each other.
Brief Description:
7. Implementation
1. Mediator
i)This component defines an interface for
communicating with Colleague objects.
2. ConcreteMediator
i) This component implements cooperative
behavior by coordinating Colleague objects.
ii)It knows and maintains its colleagues.
3. Colleague classes
i) Each Colleague class knows its Mediator object.
ii) Each colleague communicates with its mediator whenever it
would have otherwise communicated with another colleague.
8. Code Example
public abstract Colleague{
private Mediator mediator;
public Colleague(Mediator m)
{
mediator = m;
}
Colleage interface
public void send(String
message) {
mediator.send(message,
this);
}
send a message via the mediator
//Mediator interface
public interface Mediator
{
public void send(String
message, Colleague
colleague);
}
Mediator interface
public Mediator
getMediator() {return
mediator;}
public abstract void
receive(String message);
}
get access to the mediator
public class ApplicationMediator implements Mediator {
private ArrayList<Colleague> colleagues;
public ApplicationMediator() {
colleagues = new ArrayList<Colleague>();
}
public void addColleague(Colleague colleague) {
colleagues.add(colleague);
}
public void send(String message, Colleague originator) {
//let all other screens know that this screen has changed
for(Colleague colleague: colleagues) {
//don't tell ourselves
if(colleague != originator) {
colleage.receive(message);
}
}
}
}
9. Code Example
public class HeadDepartment
implements Department {
public class ConcreteColleague
extends Colleague {
public void receive(String
message) {
System.out.println("Colleague
Received: " + message);
}
}
public class MobileColleague extends
Colleague {
public void receive(String message) {
System.out.println("Mobile Received:
" + message);
}
} public class Client {
public static void main(String[] args) {
ApplicationMediator mediator = new
ApplicationMediator();
ConcreteColleague desktop = new
ConcreteColleague(mediator);
ConcreteColleague mobile = new
MobileColleague(mediator);
mediator.addColleague(desktop);
mediator.addColleague(mobile);
desktop.send("Hello World");
mobile.send("Hello");
}
}
10. PROS AND CONS
Its one of the main advantage is that we can
replace one object in the implementation
with a different other object without
affecting the classes and the interfaces.
Mediator Design Pattern is very simple to
understand and implement in real life
examples such as chatRoom, Facebook, Air
traffic control, Road traffic control etc.
Disadvantage of Mediator pattern is that it
centralises the communications between
various components and thus the mediator
pattern deals complexity of interaction for
complexity in the mediator. Because a
mediator hides protocols, it can become
more and more complex than any
individual colleague. This can make the
mediator itself a large block that is hard to
maintain.
13. Iterator is a behavioral design pattern that lets you
traverse elements of a collection without exposing
its underlying representation (list, stack, tree, etc.).
Brief Description:
14. Declare the iterator interface.
Implement concrete iterator
classes for the collections that you
want to be traversable with
iterators.
Implement the collection interface
in your collection classes.
Step 1
Declare the collection interface and
describe a method for fetching
iterators.
Step 2
Step 3
Step 4
Implementation
Step 5
Go over the client code to replace all
of the collection traversal code with
the use of iterators.
16. Code Example
public interface Iterator
{
boolean hasNext();
String Next();
}
public interface TV {
Iterator getIterator();
}
public class ConcreteIterator implements Iterator{
int index=0;
@Override
public boolean hasNext() {
if (index < channels.length)
return true;
return false;
}
@Override
public String Next() {
if(hasNext()) {
return channels[index++];
}
return null;
}
public class ConcreteTV implements TV{
private String[] channels = {"NTV", "GTV", "GB"};
private Iterator iterator;
public ConcreteTV() {
iterator= new ConcreteIterator();
}
@Override
public Iterator getIterator() {
return iterator;
}
Iterator.java TV.java
ConcreteIterator ConcreteTV.java
17. Code Example
public class Demo {
public static void main(String[] args) {
TV tv = new ConcreteTV();
Iterator iterator = tv.getIterator();
while (iterator.hasNext()) {
String channel = iterator.Next();
System.out.println("TV is Playing "+channel);
}
}
}
Demo.java
18. PROS AND CONS
We can iterate over the same collection in
parallel because each iterator object
contains its own iteration state.
Open/Closed Principle.
Single Responsibility Principle.
Using an iterator may be less efficient than
going through elements of some
specialized collections directly.
Applying the pattern can be an overkill if
your app only works with simple
collections.
19. Examples where
Iterate pattern is used
TV Remote
A good example of an Iterator is
a TV remote, which has the “next”
and “previous” buttons to surf TV
channels.
Media Players
In media players, we have a list of songs
listed and we can play the song by
traversing to the songs list and select
desired song. It’s also an iterator example.
21. Bridge is a structural design pattern that lets
you split a large class or a set of closely related
classes into two separate hierarchies—
abstraction and implementation—which can be
developed independently of each other.
Brief Description:
22. first what operations the client needs and define them in the base abstraction
class.
Declare the ones that the abstraction needs in the general implementation
interface.
For all platforms in the domain create concrete implementation classes, but make
sure they all follow the implementation interface.
Inside the abstraction class, add a reference field for the implementation type.
If there have several variants of high-level logic, create refined abstractions for
each variant by extending the base abstraction class.
The client code should pass an implementation object to the abstraction’s
constructor to associate one with the other.
Implementation
24. Code Example with any language with Diagram :
Color.java
public interface Color {
String fill();
}
Implementcolor.java
public class Blue implements Color {
@Override
public String fill() {
return "Color is Blue";
}
}
25. Shape.java
public abstract class Shape {
protected Color color;
abstract public String draw();
}
extendShape.java
public class Square extends Shape {
public Square(Color color) {
super(color);
}
@Override
public String draw() {
return "Square drawn. " + color.fill();
}
}
test.java
@Test
public void whenBridgePatternInvoked_thenConfigSuccess()
{
Shape square = new Square(new Red());
assertEquals(square.draw(), "Square drawn. Color is Red");
}
Code Steps :
26. Pros and Cons of the pattern :
It can create platform-
independent classes and apps.
The client code works with high-
level abstractions. It isn’t exposed
to the platform details.
It can introduce new abstractions
and implementations
independently from each other.
Pros :
it might make the code more
complicated by applying the
pattern to a highly cohesive
class.
Cons :
27. Examples where Iterate
pattern is used:
For Retail shop owner
For software developer
If you are a software
developer and if you are
using some software for
writing some data, you could
just call an API for doing the
job.
If you are a retail shop owner and you send
a message to the customers regarding the
new products whenever they arrive at the
shop. So, you need to intimate the
customers via SMS. You will use some
software for doing that job. You click on
send the message with the help of that
software.
29. Decorator is a design pattern that allows you to
attach additional behaviors to objects by enclosing
them in special wrapper objects that contain the
behaviors.
Brief Description:
30. IMPLEMANTION
WITH (DIAGRAM)
Ascertain that your company's domain may be represented
as a major component with several optional layers layered
on top of it.
AAI | Pro X
Figure out what methods are common to both the primary
component and the optional layers. Create a component
interface and declare those methods there.
Create a concrete component class in which to define the
base behavior.
Make a decorator base class. It should provide a field for
storing a wrapped object reference.
Ascertain that all classes adhere to the component
interface.
Create concrete decorators by extending them from the
base decorator.
The client code must be responsible for creating decorators
and composing them in the way the client needs.
31. W E ' L L M A K E A S H A P E I N T E R F A C E A S W E L L A S C O N C R E T E
C L A S S E S T H A T I M P L E M E N T T H E S H A P E I N T E R F A C E .
A F T E R T H A T , W E ' L L M A K E A N A B S T R A C T D E C O R A T O R C L A S S
C A L L E D S H A P E D E C O R A T O R T H A T I M P L E M E N T S T H E S H A P E
I N T E R F A C E A N D H A S A S H A P E O B J E C T A S A N I N S T A N C E
V A R I A B L E .
R E D S H A P E D E C O R A T O R I S A C O N C R E T E C L A S S I M P L E M E N T I N G
S H A P E D E C O R A T O R .
D E C O R A T O R P A T T E R N D E M O , O U R D E M O C L A S S W I L L U S E
R E D S H A P E D E C O R A T O R T O D E C O R A T E S H A P E O B J E C T S .
CODE EXAMPLE
WITH DIAGRAM
32. Shape.java
public interface Shape {
void draw();
}
Step 1
Step 2 Rectangle.java
public class Rectangle implements Shape {
@Override
public void draw() {
System.out.println("Shape: Rectangle");
}
}
Step 2 Circle.java
public class Circle implements Shape {
@Override
public void draw() {
System.out.println("Shape: Circle");
}
}
Step 3 ShapeDecorator.java
public abstract class ShapeDecorator implements Shape
{
protected Shape decoratedShape;
public ShapeDecorator(Shape decoratedShape){
this.decoratedShape = decoratedShape;
}
public void draw(){
decoratedShape.draw();
}
}
33. Step 4 RedShapeDecorator.java
public class RedShapeDecorator extends ShapeDecorator {
public RedShapeDecorator(Shape decoratedShape) {
super(decoratedShape);
}
@Override
public void draw() {
decoratedShape.draw();
setRedBorder(decoratedShape);
}
private void setRedBorder(Shape decoratedShape){
System.out.println("Border Color: Red");
}
}
Step 5 DecoratorPatternDemo.java
public class DecoratorPatternDemo {
public static void main(String[] args) {
Shape circle = new Circle();
Shape redCircle = new RedShapeDecorator(new Circle());
Shape redRectangle = new RedShapeDecorator(new Rectangle());
System.out.println("Circle with normal border");
circle.draw();
System.out.println("nCircle of red border");
redCircle.draw();
System.out.println("nRectangle of red border");
redRectangle.draw();
}
}
34. PROS AND CONS
You can change the behavior of an
object without creating a new
subclass.
At runtime, you can add or remove
responsibilities from an object.
Wrapping an object in numerous
decorators allows you to mix multiple
behaviors.
Principle of a single point of
responsibility. A monolithic class that
implements several possible behavior
variants can be broken down into
several smaller classes.
Pros :
It's difficult to remove a
specific wrapper from the
stack of wrappers.
It's difficult to create a
decorator whose behavior
is independent of the
sequence in which the
decorators are stacked.
The initial configuration
code of layers might look
pretty ugly.
Cons :
35. A N A S S A U L T G U N I S A D E A D L Y W E A P O N O N I T S O W N . B U T
Y O U C A N A P P L Y C E R T A I N " D E C O R A T I O N S " T O M A K E I T
M O R E A C C U R A T E , S I L E N T A N D D E V A S T A T I N G .
T H E D E C O R A T O R A T T A C H E S A D D I T I O N A L
R E S P O N S I B I L I T I E S T O A N O B J E C T D Y N A M I C A L L Y . T H E
O R N A M E N T S T H A T A R E A D D E D T O P I N E O R F I R T R E E S A R E
E X A M P L E S O F D E C O R A T O R S . L I G H T S , G A R L A N D , C A N D Y
C A N E S , G L A S S O R N A M E N T S , E T C . , C A N B E A D D E D T O A
T R E E T O G I V E I T A F E S T I V E L O O K . T H E O R N A M E N T S D O
N O T C H A N G E T H E T R E E I T S E L F W H I C H I S R E C O G N I Z A B L E
A S A C H R I S T M A S T R E E R E G A R D L E S S O F P A R T I C U L A R
O R N A M E N T S U S E D . A S A N E X A M P L E O F A D D I T I O N A L
F U N C T I O N A L I T Y , T H E A D D I T I O N O F L I G H T S A L L O W S O N E
T O " L I G H T U P " A C H R I S T M A S T R E E .
Examples where
Decorator pattern is used
37. Composite is a structural design pattern that
lets you compose objects into tree structures
and then work with these structures as if they
were individual objects.
Brief Description:
38. Create a leaf class to represent
simple elements. A program may
have multiple different leaf classes.
Create a container class to represent
complex elements. In this class, provide
an array field for storing references to
sub-elements.
Step 1
Make sure that the core model of
your app can be represented as a
tree structure.
Step 2
Step 3
Step 4
Implementation
Step 5
Finally, define the methods for adding
and removal of child elements in the
container.
Implement concrete iterator classes
for the collections that you want to
be traversable with iterators.
40. Code Example
public class FinancialDepartment implements Department
{
private Integer id;
private String name;
public void printDepartmentName() {
System.out.println(getid().getSimpleName());
}
// standard constructor, getters, setters
}
public interface
Department {
void
printDepartmentName();
}
Department
FinancialDepartment
public class SalesDepartment implements Department {
private Integer id;
private String name;
public void printDepartmentName() {
System.out.println(getid().getSimpleName());
}
// standard constructor, getters, setters
}
SalesDepartment
41. Code Example
public class HeadDepartment implements Department {
private Integer id;
private String name;
private List<Department> childDepartments;
public HeadDepartment(Integer id, String name) {
this.id = id;
this.name = name;
this.childDepartments = new ArrayList<>();
}
public void printDepartmentName() {
childDepartments.forEach(Department::printDepartmentName);
}
public void addDepartment(Department department) {
childDepartments.add(department);
}
public void removeDepartment(Department department) {
childDepartments.remove(department);
}
}
public class CompositeDemo {
public static void main(String args[]) {
Department salesDepartment = new SalesDepartment(
1, "Sales department");
Department financialDepartment = new FinancialDepartment(
2, "Financial department");
HeadDepartment headDepartment = new HeadDepartment(
3, "Head department");
headDepartment.addDepartment(salesDepartment);
headDepartment.addDepartment(financialDepartment);
headDepartment.printDepartmentName();
}
}
}
HeadDepartment
CompositeDemo
42. PROS AND CONS
Open/Closed Principle. You can introduce
new element types into the app without
breaking the existing code, which now works
with the object tree.
You can work with complex tree structures
more conveniently: use polymorphism and
recursion to your advantage.
It might be difficult to provide a common
interface for classes whose functionality
differs too much. In certain scenarios,
you’d need to overgeneralize the
component interface, making it harder to
comprehend.
45. The Template Method pattern provides a method in a super-class,
usually an abstract super-class, and defines the skeleton of an
operation in terms of several high-level steps.
Generally, these steps are implemented by additional helper methods
in the same class as the template method.
Brief Description:
46. Implementation :
We are going to create a Game abstract class defining
operations with a template method set to be final so that it
cannot be overridden. Cricket and Football are concrete classes
that extend Game and override its methods.
TemplatePatternDemo, our demo class, will use Game to
demonstrate use of template pattern.
48. Code :
Step 1
Create an abstract class with a
template method being final.
Game.java
public abstract class Game {
abstract void initialize();
abstract void startPlay();
abstract void endPlay();
//template method
public final void play(){
//initialize the game
initialize();
//start game
startPlay();
//end game
endPlay();
}
}
49. Step 2
Create concrete classes extending the above class.
Cricket.java
public class Cricket extends Game {
@Override
void endPlay() {
System.out.println("Cricket Game Finished!");
}
@Override
void initialize() {
System.out.println("Cricket Game Initialized! Start playing.");
}
@Override
void startPlay() {
System.out.println("Cricket Game Started. Enjoy the game!");
}
}
Football.java
public class Football extends Game {
@Override
void endPlay() {
System.out.println("Football Game Finished!");
}
@Override
void initialize() {
System.out.println("Football Game Initialized! Start
playing.");
}
@Override
void startPlay() {
System.out.println("Football Game Started. Enjoy the
game!");
}
}
50. Step 3
Use the Game's template method play() to demonstrate a defined way of
playing game.
TemplatePatternDemo.java
public class TemplatePatternDemo {
public static void main(String[] args) {
Game game = new Cricket();
game.play();
System.out.println();
game = new Football();
game.play();
}
}
51. Step 4
Verify the output.
Cricket Game Initialized! Start playing.
Cricket Game Started. Enjoy the game!
Cricket Game Finished!
Football Game Initialized! Start playing.
Football Game Started. Enjoy the game!
Football Game Finished!
52. PROS AND CONS
Pros:
1. Easy to Implement
and readable
2. Flexible.
3. Clear Architecture
Cons:
1. Enforce a particular
Design
2. Maintenance Issue
55. Singleton pattern is one of the simpleest design
patterns in java. This type of design pattern comes
under creational pattern as the pattern provides
one of the best ways to creat an object
Brief Description:
60. Pros and coins
You can be sure that a class has only a
single instance.
You gain a global access point to
that instance.
The singleton object is initialized only
when it’s requested for the first time.
Violates the Single Responsibility
Principle. The pattern solves two
problems at the time.
The Singleton pattern can mask
bad design, for instance, when the
components of the program know
too much about each other.
The pattern requires special
treatment in a multithreaded
environment so that multiple threads
won’t create a singleton object
several times.
61. Singleton pattern used
It is used where only a single instance of a class is
required to control the action throughout the execution
Singleton Pattern Used in Java Stand Library
1.
Singleton Pattern Used in driver objects
2.
62. Md. Shahin Alam
ID:201-15-3186
Ahmed Ishtiak Nihal
ID:201-15-3277
Yousuf Rayhan Emom
ID:201-15-3220
MD Saimur Rahman Swarnab
ID:201-15-3303
Team member