تدريب Shadowing: Design Patterns in Java Theory - تعلم التحدث بالإنجليزية مع YouTube
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Welcome back aliens this is Navin Reddy from Telescoot Learnings and today we'll discuss something about design patterns.
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Welcome back aliens this is Navin Reddy from Telescoot Learnings and today we'll discuss something about design patterns.
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Now you know
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when you you can build your own software right of course anyone can build a software
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and to develop a software what we should know is programming language right
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and one of the best language to learn so that you can build a software is Java of course right.
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Now let's say you want to be a software developer
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so what you will do you will spend one week
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and then you will learn Java
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and the next week you start making softwares awesome right but
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when you build a software you have to face lots of
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problems now this problems there are some problems out of this
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which are very common problem which has which
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which are faced by lots of software developers so what if
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if you have a common problem can we just solve it
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and then anyone having the same problem can use that can use
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that solution of course right we can do
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that provided that's not a domain problem example
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when you're working on a banking application so that's a different domain
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when you're working with maybe a social networking app that's a different domain
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but if you talk about the conceptual
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which is object oriented conceptual problems we can solve
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that with the help of some common solution and now
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so throughout the industry we have some professionals they provided something called as best practices
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and we call those best practices as design pattern.
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So it all started in 1994.
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So there was a book by four people and in
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which they have mentioned the principles of design pattern or principles of object-oriented design patterns.
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So the main motto was just to
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so whenever you have object-oriented software the first principle was you should always prefer composition over inheritance
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and the second principle was whenever you code, code for interface not for the implementation
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and depend about these two lines they created the whole set of design patterns
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and these four people were commonly known as gang of four goons right
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so we have gang of four people so we have this four people
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and now so they have defined some design patterns so
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and we have just classified those design patterns of three sections
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so we have this truck the creational design pattern we have structure
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and then we have behavioral so we have lots of design pattern right
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so now if you want to build software using best practices follow this design pattern
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but there are two questions now the first question is should we know all design patterns
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and the answer is yes you should know all the design
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patterns the second question should we implement all these design pattern of course right
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so let's say
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when you are building a next software now you will be
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using all design pattern right hold on that's not the case you should not use all design pattern in one on software, it should depend upon your requirement.
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Look at your requirement.
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If your requirement says, we want to create an object, how to get an object, then we have to follow creation design pattern.
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Right?
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Let's say I want to write a software in which you want to compose objects.
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So let's say you have an object inside
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that you want to include one more object or if you have an object here which provides some features, you have object here which provides some features and this object wants to use this object,
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then we have to work with structural design patterns.
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The third one is let's say you have two objects we don't want to compose them
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but we want to make some communication between those two objects.
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At this point you have to use behavioral design pattern right
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so it all depends upon your requirement don't rush of don't rush to use design patterns.
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Think about your logic
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or think about your problem think about your software problem try
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to solve those problem with the help of best practices
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which is design pattern here and you can use any of this
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so approximately we have 13 23 design patterns we have some more
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but this is basic design patterns you have here okay
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so let's start the first one we have creation design pattern
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so in which you have six
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or five design patterns one of the my favorite is factory pattern
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so when you if you're working with spring framework
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if you're working with hibernate you know about what is factory
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right uh then we have singleton you can create only one instance of a class amazing right?
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No one use it now.
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So we have all the design pattern here for the creational.
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Because here your concern is about creating the object.
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How to create an object?
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Maybe using factory, maybe using singleton.
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So it's all about creation of the object the next one is structural now what it means
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so if you have again two objects
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and you want to compose this object inside your object then you can use structural
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so if you are a Android developer
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if you have worked on swing you might be knowing about
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adapter design pattern right we after with this we have lots of design patterns one of my favorite is Fasar
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In Hindi we have this kahawat, Sare Fasad Ki Jari Yei Hai That's Fasad Design Pattern here.
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If you don't know Hindi that's okay.
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That's what a weird, pakav joke.
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So we have Structural Design Pattern which we have 6.
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We have 7 design patterns here.
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The next one is Behavioral.
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In which we have, I don't know how to call this.
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I guess this is 11 design patterns.
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So in which we'll talk about Observer Design Pattern design pattern we'll talk about visual design patterns
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so we will try to cover all design patterns i will try to cover everything
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but basic ones will be there okay just just to make you understand how to use design patterns
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so this is design patterns and
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if you want to know the actual implementation of it
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that we'll see in the whole series we'll talk about one by one design patterns okay
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so make sure you subscribe the channel so
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that you will watch all the design pattern and thank you
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so much for watching and if you have any doubts any concern about
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design patterns make sure you comment so that I will try to answer that questions
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