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No matter how good or experienced a programmer is, they will run across issues when programming. As a number of problems arise in code, you may see some commonalities, and when you try to address them, you may detect certain patterns.
The term "Design pattern" comes into play here. Design patterns, in basic words, are tried-and-true solutions to common programming problems. For instance, creational design patterns address object creation issues.
They've been around for a long time, but Erich Gamma, John Vlissides, Ralph Johnson, and Richard Helm's classic 1994 book Design Patterns: Elements of Reusable Object-Oriented Software, often known as GOF design patterns, popularized them.
This book details 24 reusable design patterns for solving common programming issues.
The advantages of design patterns are big and that's why they may be found in a wide range of frameworks, libraries, and programming languages.
By the way, if you need a up-to-date, and comprehensive course to learn Design pattern in Java then there is no better course than Dmitri Nestruck's Design Patterns in Java course on Udemy.
This course will teach you how to implement classic Object oriented design pattern like State, Strategy, Factory, Decorator using Java 8 Lambdas, Stream and other new Java features. It's not free but totally worth it.
1. Java Design Patterns and Architecture [FREE]
This is one of the excellent free course for learning Java design patterns. It will show you how to develop better software by identifying common challenges and using design patterns to achieve a better result.
This course will teach you over 20 design patterns from Gang of Four's famous design pattern book, which is widely regarded as the holy bible on the subject.
A concrete illustration of the problem that the pattern will address, as well as its benefits and drawbacks, is provided for each design. With the extensive Java lessons offered, you will be able to learn how the pattern works in practice.
After finishing the course, you should be able to recognize typical issues in your code, apply the appropriate design pattern, and develop a more maintainable and legible object-oriented solution.
2. Learn Creational Design Patterns in Java [Free]
This course will teach you how to use SOLID principles and design patterns in Java to develop smart, reusable software. The course is organized into two sections.
In the second section, he discusses design patterns and how they address a common issue. You must be able to identify the problem and comprehend which pattern will help you in order to employ design patterns, and this is where this course excels.
In a nutshell, this is a fantastic course for learning the fundamentals of software design, architecture, and design patterns in Java so that you can write better code.
3. Design Patterns in Software Modeling [Free Udemy Course]
This is one of the nice Java design pattern courses available for FREE on Udemy. It not only includes GOF patterns such as Command, Decorator, Adapter, Strategy, Proxy, Chain of Responsibility, and Interpreter, but also the well-known SOLID design concepts that serve as the foundation for design patterns.
This is also a highly hands-on course in which the author will demonstrate how to use IntelliJ IDEA to apply a certain design pattern.
Because most demos are single files, you may download the file associated with the course and run it with Intellij IDEA, Eclipse, NetBeans, or any IDE of your choice.
The only drawback of this course is that it mixes Hindi and English a bit which may not be comprehensible for native English speakers but it makes it the best course for learners in India who understand both Hindi and English.
4. TypeScript Design Patterns [Free]
His examples are real-world and highly relevant, which makes it easier to understand the principles. For example, utilizing the Strategy pattern to develop a Payment processing engine is a wonderful idea since you'll need to process payments in a variety of formats, such as cash, credit cards, coupons, Bitcoins, or something else entirely.
In a nutshell, this is excellent training for experienced Java developers and anybody interested in learning about GOF design patterns such as Visitor, Adapter, and Decorator. The only drawback of this course is that not all the patterns are covered but whatever is covered they are covered nicely and you will understand them better.
In short, one of the best courses to learn design patterns is TypeScript, and on top of that, it's completely free.
5. Java: Refactoring to Design patterns [Free Trial]
This is just another extensive course that will teach you 24 Object-oriented design patterns from the well-known GOF book.
The tutors are extremely competent and have previously worked for Google and investment institutions. They recognize that design patterns are not intrinsically simple at first appearance, and they go to great lengths to break them down in a way that is understandable.
This course covers OOP design concepts as well as design patterns, just like the other two. In a nutshell, this is an excellent course for learning Java design patterns and mastering all 24 of them in order to build better code.
By the way, you would need a Pluralsight membership to join this course which costs around $29 per month or $299 per year (14% discount). I highly recommend this subscription to all programmers as it provides instant access to more than 7000+ online courses to learn any tech skill. Alternatively, you can also use their 10-day-free-pass to watch this course for FREE.
That's all about the best free online courses for learning Design patterns. These classes are an excellent method to improve your knowledge of object-oriented design and tried-and-true GOF techniques. You will understand what those patterns represent and when you may apply them to write better code after finishing these courses. It will also make it easier for you to share your thoughts with your teammates and coworkers.
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Thanks for reading this article so far. If you like these best free TypeScript and Java Design Pattern courses then please share them with your friends and colleagues. If you have any questions or feedback then please drop a note.
P.S. - If you don't mind paying a few bucks for learning a valuable skill like design pattern in Java then you may want to see Java Design Patterns & SOLID Design Principles course on Udemy. This course will teach you how to implement classic Object oriented design pattern like State, Strategy, Factory, Decorator as well SOLID design principles It's not free but totally worth it.