Understand the how and the why of the gang of four design patterns using Java.
About The Java Design Patterns Course download
Welcome to The Java Design Patterns Course download, your instructor in this course is Jason Fenton who’s been teaching online classes for over 14 years. Jason is a very experienced developer, with over, 18 years of real-world commercial experience. He’s the instructor in one of his most popular C programming courses, which is published on this channel. It has a range of experience in many programming languages, especially Java.
The Java Design Patterns Course download is published by the learn programming Academy, founded and created by temperature Parker, the teacher and software developer, with over 35 years of experience, teams go through his own students, and the Academy is to make available the highest quality training to anyone wanting to learn, real-world software development skills design patents are a very important Java skill to learn about the end of this course, you’ll have a solid understanding of the fundamentals of design patterns, you’ll be able to create Java applications that use design patterns, you’ll understand the three types of design patterns, namely creational behavioural and structural and you learn about the NBA architectural patterns, and as fun as that you will have learned detailed aspects of common design patterns, 23 from the Gang of Four, and all this using the Java programming language. In short, you have detailed knowledge of design patterns, which you can apply to future Java projects. The reality is that design patterns are an important and valuable skill, and you’ll learn those in this course. Feel free to check the syllabus of this course on this page for a complete list of topics. The ideal student would be someone with a basic knowledge of Java, who’s eager to enhance their skills by mastering design patterns. If you’re ready to start the Java design patterns course, then click the enrol button to get started. And feel free to try the free video previews available on this page. We look forward to seeing you on the inside.
Advantages of Design patterns
Welcome back. Let’s like start, I’d like to talk about the advantages of design patterns.
Why do we use design patterns? Most commonly stated reasons for studying and utilising design patterns are because they enable us to do the following. They have they provide the best solutions for certain problems faced during software development so I mentioned this quite a lot in the last lecture, but it’s an important point to remember, calm problems conference of software solutions.
And what this basically does is it enables software reuse is incredibly important. If we can reuse existing solutions, it will save time and time is a big deal when you’re writing code. So it makes it easier to reuse successful lines designs in architecture software reuse is one of the biggest advantages. That’s why we really want to use them. The solutions have been tried and tested. They’re going to work, experienced developers have come up with new solutions so they’re going to work, and things that you know and you have confidence in working is a tremendous advantage, learning these patterns helps unexperienced developers learn software design and easy and faster way.
Now that they’re documented and their other for studying, you get the benefit of learning from other people, or you get a head start on problems that you can avoid as a new design new developer. If you know that people have encountered these problems and they have solutions for them. You don’t have to waste your time trying to figure it out. So, it helps you avoid reinventing the wheel, a big event, you also use design patterns to basically understand object-oriented principles that achieve high-quality design.
You do not want to just write code, just to get the correct output. You want to make sure that your code is easily maintainable, you can achieve that by writing high-quality code, high-quality code is highly dependent on high-quality design. So this includes keeping classes separated, preventing them from having to know too much about one another. Right this concept of coupling you don’t want to have a lot of dependencies between classes, it’d be really nice if a class is very highly cohesive it doesn’t seem to have single focus and sounds all, you can take it out you can remove it and it doesn’t cause all sorts of problems. So these three concepts that are important in the high-quality design are encapsulation inheritance polymorphism in design patterns heavily use these concepts, it may not be direct inheritance maybe inheritance through interfaces, but these are really important things. And this is why you want to study design patterns, you don’t reinvent the wheel.
And you don’t have to animate you become a very very high-quality programme and high-quality designer, you’re going to be one of the best out there, coming up solutions, your employer or subsequent employees. Employers are gonna want to hire you because you know what you’re doing because you’re focusing on high quality. So this is why we use design patterns. We also use them because it improves communication, either amongst your team or just co-developers you’re working with other teams, you have this common platform right, we talked about design patterns what they do and how they have a name, a description problem, you can easily talk to your co-workers and say Hey, what do you think of the adapter in this, in this particular situation. Yeah, I think that’s a good solution. So it’s good to provide it to provide a good point of reference. During the analysis and design phase of a project.
They allow you to describe your programming approach succinctly in terms of other programmes can easily understand, you just throw around these words, and it really speeds up the process. So programmes confer programme that uses logic just think of that, hey, hey Mike, I need you to Singleton oh he knows exactly what you mean. Oh, Singleton, you only need to create one It’s all right. I’d use that before. That’s a great solution. More inexperienced junior team members can see that the senior developers who know the design patterns have something of value, that makes them want to learn from you. Right, so the junior members will respect you more they’ll ask for help but want to learn from you.
So provides motivation. And it really really helps more low or low level or inexperienced programmers become better programmers by learning these powerful concepts. It also gives a higher perspective on the problem at a higher level again concerning design, and absorption analysis and design to go into the analysis is really a tough thing to understand you know analyse requirements come up with a really suitable design, and if you can have that high perspective. by understanding design patterns, it’s going to again it because abstraction is such a big deal when it comes to design patterns, you don’t have to worry about the details too early. When you look at a design pattern you understand them, and you’re now trying to solve the problem. You can take a step back. So helps a designer get a design that is correct and has high quality much faster than it was the past without using designers. It improves marketability and maintainability of code. What this means is you can actually change the code, much easier without breaking everything. You can find and fix bugs much easier because if you use the design pattern that design pattern is very loosely coupled.
And so it’s going to, it’s very high cohesive code so you’re going to be able to find a fixed policies and get coupling and cohesion I’ve used those terms, we’ll talk about in more detail but those are really important terms to understand, when you have time tested solutions that have evolved into structures that can handle change more readily than will often first comes to mind as a solution. So you have to be able to change things. The software is constantly evolving, it’s constantly changing, and you have all these other team members or other developers, modifying that code if it’s hard to change something.
It’s going to be a nightmare. So making the code easily changeable is going to be a big huge deal and design patterns allow that. Because they improved documentation, their results. You know from the common terminology people again I mentioned this before but it’s a permutation code is much easier to understand much easier to maintain because of these great patterns of solutions. So that’s why we use design patterns right you know really really important to understand that if you don’t understand why you’re using them while you’re studying them shouldn’t really be in this course. It provides high-quality solutions, improves maintenance need a beauty box which lawmakers got you covered. It was addressed by good awake slowly solve many of the days to day problems.
And they saw them in many different ways. So how do you identify the appropriate objects to utilise or tree? One thing when you first start writing code you start coming up with some kind of solution or design is an object-oriented language, you ask yourself, what objects should I include in the system. And a lot of times you’re, you’re, you know, you don’t want you don’t know where to start. Some classes may tell you okay well, describe the system in terms of your narrative paragraph, and then identify the nouns are going to be your objects, but really the best way to understand what logics are appropriate for situation is through experience through learning design patterns. They greatly help identify objects of solutions basically they’re documented they tell you exactly what objects you need. So object packages both data and procedures that operate on that data. It’s a problem that you have to identify and can help design that. How to specify object interfaces, right, we all know what an interfaces contract, basically between a client, and somebody that wants to use that interface itself interfaces are really advantageous because they provide this abstraction, and they allow for isolation.
So, when you come up with and how to identify an interface that’s the problem you face in design patterns could help with this every operation declared by an object specifies the operation name, the object it takes as parameters and the operations returned it. This makes it very easy to create the interface. So the interface characterises the complete set of requests that can be sent to the object. How to specify object computations right we come up with the objects in the system. We understand what interfaces we need. Now we need to actually go and implement. Well, this is a common problem, obviously, implementing solutions.
The implementation is defined defined defined by the class you know that the specifies the objects internal data representation in defines the operations that the object form. All these things are held by understanding design patterns have a high-level foundation that is going to are going to be the script scribe so these three problems are reduced in help a lot. If you understand design patterns, the multiple sets you have available for you to you, the easier it is going to be able to identify the objects, specify the interview to the quotation. It’s all about making you a better programmer or high-quality programmer and design patterns will do that. problems that just by Design Patterns again continued determining object granularity. So we know objects can be very large. And you can have many, many objects right.
Usually, the more objects you have the harder to maintain, if the objects are not cohesive they have a tonne of code again hard to maintain design patterns will provide that granularity. They’ll say, how big should this object be how many objects should you have. So the granularity can include size and number it also can represent everything down to the hardware all the way up to the entire application. So design patterns address this granular issue. For example, the facade pattern now we’re going to learn about describes how you can represent complete subsystems is optics, so right there it’s going to tell you this is how many objects you need for this subsystem.
The flyaway pattern. We’re going to, it will describe how to support a huge number of objects at the finest granular abstract factoring builder, or get it to logics whose only responsibilities are creating other objects. Right, that’s a level of granularity. How do I create this object, they identified that they have a common solution for that. The visitor in the command will yield objects was only responsibilities are to implement a request on another object or group of objects. So they have a single responsibility they’re highly cohesive. Right. And again, allows it easier to maintain the design in the code. To summarise design patterns advantages right. They allow for software reuse, we reuse these high-quality solutions to commonly recurrent problems.
They also establish common terminology to prove communications with teams, talking about that they shift the level of thinking to a higher perspective, you don’t get bogged down in the details and try and solve the problem, you first look at at a high level, and then you try to solve it you get down to the details when you need to get down to the details. They decide whether you have the right design, not just one that works right it’s a high-quality design again because it’s been tried and tested, it’s the right design for that problem.
Before that situation. Design Patterns also improve individual learning and team learning, you can learn things quicker. By understanding these concepts, improve them optimal building quality of code is constantly changing. If the code is so tightly coupled and it’s so hard to change. Every time you need to add something new, you’re gonna break everything. So if you can make your code, adaptable to change. It’s gonna be a big deal and design patterns lie to do that, they facilitate the adoption of improved design alternatives, even when patterns are not used explicitly. So because of your knowledge base, and because of the different solutions you have, it allows you to come up with other solutions other alternatives.
They discover alternatives to larger hair to target so it allows you to avoid using this gigantic inherence our developers tend to overuse, you can avoid them through the use of your experience with design patterns up into this point I described a lot of theoretical approaches or theoretical definition design matters. What is a design pattern, why do we use it what are the advantages?
So we’re going to get into more practical solutions. I’m going to talk more about Java code, and more about design. Examples or implementation examples, but again it’s important. Early on, to understand what you’re studying. Why do you want to study, why is it important. So the advantages and the definitions, the high-level overview, I think is necessary. If you’re getting bored. You can just jump right into some coding examples start right off with some of the upcoming lectures, specific design patterns. But if you really want to have a good well rounded well-rounded understanding of why you use design patterns and the principles the strategies that you’re employing please stick with it. Thank you. Just The Java Design Patterns Course download For Free and Start learning.
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