Dr Heinz M. Kabutz – Java Design Patterns

I used the same C and BASIC coding techniques in my C++ codes. This resulted in a lot of switch statements scattered throughout my codebase. 

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Dr Heinz M. Kabutz – Java Design Patterns

Finally…the secret weapon that makes you a success Java A programmer writes code that is easily maintained for many years. This is the same as the engineers who brought us the program. Java Virtual Machine and powerful ecosystem ….

” First of all, best wishes for this new year ! I just wanted to tell you that I have completed the Java Design Patterns Course, it was very interesting the examples were very clear and the books recommendation was awesome, I was following the course with some of the books you mentioned that I already have and I put a couple of your recommendations on my Amazon wish list.”

– Edison Martinez

I studied coding in BASIC like so many programmers of my generation. After a quick foray into Turbo Pascal my university guided me gently to C.

Professor MacGregor then introduced C++. His lectures were filled with ramblings and matched handwriting. Stroustrup was my bible.

I struggled through university to get rid of bad habits that were engendered by years of C. Polymorphism and BASIC. Switch statements and multi were not my tools of choice.-Conditional ifs.

Heinz 1996: Writing switch statements

Through the generous use of CTRL+C, and CTRL+V, I was incredibly productive. One of my masters courses was editing for SDL, which is used in network protocols. This was sold to a French company by my professor. They were impressed by my program when they visited me at the University of Cape Town. A few modifications were needed to make it better. I was able to complete everything in a matter of hours.

It was only when I started working that I realized everything I had learned about OBJECT.-ORIENTATION WAS WRONG

I had used the same C and BASIC coding techniques in my C++ codes. This resulted in a lot of switch statements spread throughout my codebase. Each switch statement had to be changed individually whenever I needed to add a design element. If I had forgotten one, which was quite common, the feature would no longer work. If I forgot to change the switch for printing, my new element would appear on the screen but not on the printed copy. Each element that I added was tested separately to ensure it worked.

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This kind of code behavior might work if you are the only one who is working on it. This doesn’t make you a happy team member.

French colleagues were sad to see Heinz Leave, but they can be happy to not have to maintain his switch status

My mentor gave me the GoF book when I was starting my first job. “Here, you have to read this.”

This is what you need to know.

I did. Many of the patterns were familiar to me from my years of programming C++. It was too much. What can I possibly learn from it?

Martin Fowler, a Cape Town conference organizer, was my next encounter. He described “Design Patterns” As the most important book on software development of the decade.

It was worth a second glance so I took it out. Maybe I missed something? Perhaps it was obvious at first glance.

I DIDN’T UNDERSTAND ANY WORDS ON THE SECOND READ

How could it be that I had only one year of coding experience made me so stupid? It is possible.-The opposite effect of world coding would be to make me more valued as a programmer.

Yes, it did. The book was not worth the time, and I wasn’t able to grasp its true value the second time I read it. Martin Fowler’s words made me reread the book twice. I had previously discarded it. “completely obvious”.

“If one has to choose to take a single design patterns course it should be Java Design Patterns by Heinz Kabutz. I can’t recommend it enough.The class is very well organized and covers 30 design patterns. What sets it apart is how well each pattern is explained and the coverage of several less known design patterns like Memento, Essence, Object Recursion, Acyclic Visitor. Heinz spends enough time to give details how each pattern originated and its main usages. Currently its 5 edition the course covers the material in great depth, but at he same time doesn’t spend more time that necessary on each pattern. What I find very useful are the comments about common pitfalls to avoid and ways to extend and improve the implementation of these design patterns using latest language features of Java 8,9 and 10. A personal favorite of mine are the exercises that follow each design pattern allowing the student to put to practice what she learned. And if you complete all the exercises and send them to Heinz he will issue you a course completion certificate.”

Stefan Dragnev

I tried to remember where it was in our book, as I went through each pattern. Java project. A design pattern study group was also formed, which met every Friday lunch. Martin Booyens, my colleague, still describes the Visitor design. He spoke of the dominee (Afrikaans word for parson) who visited. While I can still recall his analogy 20 years later, his explanation of this simple pattern was beyond me. It didn’t work out as well as we hoped when laypeople taught the patterns.

TEACHING DESIGN PATTERNS CAN BE HARD. MANY ONLINE PATTERNS COURSES ARE STRONGLY ERRATED THAT WILL BLOW YOUR HEART.

Eureka! moment came during my third reading of GoF. moment. Every pattern employed polymorphism. Even the Singleton. This was the main concept that was used all over. The majority of the patterns used both inheritance and composition. We used composition when in doubt.

All those horrible switch statements could have been avoided if I knew this before I started university.

I was determined to learn the nuances of every design and immersed myself in patterns. I read books and papers and reached out to John Vlissides, one of the original authors of the GoF book. I also did technical reviews on papers he wrote for IBM (Composite1 & Composite2). Christopher Alexander’s pattern language was the inspiration for the writing I studied. After months of preparation, it was finally time to give my first class. Java design patterns course.

This course refers to BOOKS

Christopher Alexander: The Timeless Way of Building

John Vlissides Pattern Hatching

Programming Language Pattern Design 3

Programming Language Pattern Design 4

Take your first step Design Patterns

There are many others. I have about 30 books on pattern design. They are there so you don’t have too. These are the most crucial. Pattern Hatching in particular. Buy one book.

INTERESTING HAPPENED

It was quite an interesting experience. I would be teaching a class in a small company. I received an order for a larger course a few months later. This continued until all of the development staff had completed the course.

This is why? Why did companies want everyone in the company to know this?

After just one week of training, programmers were able to be far more productive.
They have improved communication within the team.
They are more able to comprehend existing designs.
It is much easier to learn design patterns when you have a coach.
The best value for money Java Training available

Ordinary Java Courses and university curricula are focused on the syntax of the language but not the semantics. If students are lucky, they will be able to learn that there are three types of pattern: structural, behavioral, and creational. However, they will not see the practical uses of patterns.

In my Java Design Patterns You will see where each of these patterns are used in the course. Java Development Kit. This makes our course extremely practical. The patterns aren’t just abstract concepts. These patterns are made from timeless software.

DESIGN PATTERNS ARE IMPORTANT TODAY

Our 18-year history has been marked by many changes. Design Patterns Course has remained relevant, useful and effective. The Iterator, Strategy and Composite patterns are equally important. Java 11 with them Java 1.1. Like in the 90s patterns make programmers more productive, and allow them to communicate better.

Java 8 additional lambdas and method refers to the language. This makes Command and other patterns easier to use. Interfaces can have default methods that do not require us to use abstract class.

“Some of the exercises I managed to do alone.. and some not.. but those which I “”copy” I tried to understand by looking through code and debugging it. I also watched the walkthroughs afterwards.

This course is great and I’ll be back without any breaks. It covers many patterns, and I like the way it is explained. The exercises also include good examples and uses cases.

It’s important to mention that I enjoyed your teaching style and how you shared your knowledge. Great course, well worth it!

– Vatroslav Vukovic
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“The course has a lot of code examples to better understand the various design patterns.What I’ve learned: capturing/non-capturing lambdas, use only ConcurrentHashMap since Java 8, performance considerations, etc. The difficulty of the course is exactly right: difficult code samples and patterns are explained in more detail. What I also liked: Solution walkthroughs of the exercises with live coding. Sometimes Heinz came up with better solutions than he had in his model answers.He answers all questions very carefully.”

Anonymous, Feedback from an insider-House course in Graz, Austria

No one enjoys reading forward-looking information in books or courses. “Don’t worry about this, we will do it in a later chapter” It can distract us. We try not to have as many as possible.

An extensive introduction is provided Java on modern virtual machines. Many of the concerns from the original Gang are still valid today.-Of-The inspiration for four books stemmed from static compilation. Java Optimize our code-The-fly. If it can verify that the method is safe, the JIT compiler will allow you to inline polymorphic methods calls. It will undo any optimization if a different type of subclass is discovered later. Inlined are also the incidence costs. Too many items? You don’t have to worry, the garbage collector does an excellent job managing them.

One of the ing precepts refers to meronomy. This defines what we mean. “part-whole hierarchy”. We care about meronomy because we must avoid memory leaks within our designs. Memory leaks should be eliminated. JavaAutomatic memory management. They still occur when we ignore meronomy.

An important concept to consider is the intrinsic versus extrinsic states. You will find it in many of the patterns. You can often rewrite the implementations to switch from one to the next. Both are good and bad. However, extrinsic allows us to share objects. Intrinsic can be a little more object-orientated.

THE GOLDEN ORDER

Following our detailed introduction, you will find simple patterns that are common everywhere. Patterns Like Strategy, Iterator and Proxy.

Many books and courses are based on the Singleton and Factory Method of creating patterns. These are simple patterns, so it is assumed. They are not. Singleton is a complex pattern with many subtleties. This pattern allows for polymorphism as well as multiple instances of the “Singleton”. What is the difference between lazy and eager initialization? This is a common mistake in courses, and the code can cause problems in production.

The Quintessential Singleton

These patterns are sourced both from the original Gang as well as from other sources.-Of-Four books by Erich Gamma and others, as well as proceedings from the Pattern Language of Program Design conferences. They are divided into three categories: behavioral (B), structure (S), and creational patterns (C). Here’s the golden order to follow through this maze.

Abstract Class (B), Builder/C), Essence/C), Memento/B), Proxy/S), flyweight (S), Strategy/B), Null Object/B), Visitor/B, Acyclic Visitor/B), Visitor/B), Visitor/B), Acyclic Visitorsor/B), Object Recursion/B), Visitor/B), Singleton/C), State/B), Facade/S), Prototype/C), Abstract factory (C), Interpreter/B), (B), (B), Interator (B), Bridge/S), Chain of responsibility (B),

EXERCISES and EXERCISES EXERCISES EXERCISES EXERCISES EXERCISES EXERCISES EXERCISE, EXERCISES EXERCISES EXERCISES EXERCISES EXERCISES EXERCISESSES EXERCISES EXERCISES EXERCISES EXERCISES EXERCISES

You learn more from doing than listening. To improve our understanding of a pattern, we follow it with exercises. Each exercise has a walkthrough and model solution. I will also show you how to solve the problem. Some exercises are difficult. Some are more difficult than others.

Exercises, exercises, exercises, exercises

There are many types of patterns that can be done:

Use Patterns In the JDK: Practical Application of Patterns Using Existing Classes from the Java Kit for Development
Patterns for refactoring existing designs: Make bad designs more manageable by using design patterns.
Fun and games: Not all exercises can be used in a practical way. Lab rats are brought back to life with mementos and rappers are made to sing using the adapter pattern.

COURSE COMPLETION ZERIFICATE

Your employer purchased this shiny new course for you. What can you do to prove that you have completed the course?

Teachable tracks your progress throughout the course. You can mark each section as completed at the end. “completed”. A course completion certificate is available once you have completed at minimum 88%. This certificate can be claimed by submitting completed exercises. Heinz Kabutz For marking. Your course price includes the cost of your certificate and marking.

UNHAPPY? Get a 100% refund within 30 days!

This is what we believe to be the best value-For-Money Course in the Java world. It can be used at all levels Java Knowledge: Intermediate, Advanced and Beginner. Each person will be able to learn something that will make them better. Java programmers.

We offer a 100% money back guarantee to put our money where it is needed.-You can get a refund within 30 days after purchasing the course. No questions asked. Let us know if this training is not for you, and we will reimburse you.
Course Curriculum

Get your instant download Dr Heinz M. Kabutz – Java Design Patterns

Slides

Design Patterns Slides and exercises

Playground Package

The Course

1.1. Lay of the Land (8.40).

1.2. Why Learn Patterns (15:35)

1.3. What is a Design Pattern (6.01)

1.4. References used in course (7:46).

1.5. Unified Modeling Language, (UML), (14:02).

1.6. Java Memory Management (11.41)

1.7. Java HotSpot Optimizations (6.53)

1.8. Modern Java Syntax (3.56)

2. Abstract Class Pattern (PLoPD4) (15.35)

2.1. Abstract Class Pattern Exercise Walkthrough (15.52)

3. Builder Pattern (GoF, Effective) Java) (19:43)

3.1. Builder Exercise 1 Walkthrough (6.46)

3.2. Builder Exercise 2 Walkthrough (2.15)

4. Essence Pattern (PLoPD4) (10.39)
Preview
5. Memento Pattern (GoF) (22:15)

5.1. Memento Pattern Exercise 1, Walkthrough (10.59).

5.2. Memento Pattern Exercise 2 Walkthrough (3.07)

6. Proxy Pattern for the GoF (32.18)

6.1. Proxy Pattern Exercise 1 Walkthrough (3.47)

6.2. Proxy Pattern Exercise 2, Walkthrough (7.22)

7. Flyweight Pattern (GoF), (51:37).

8. Strategy Pattern (GoF) (33:34)

8.1. Strategy Exercise 1 Walkthrough (15.02).

8.2. Strategy Exercise 2 Walkthrough (9.03)

9. Null Object Pattern, (PLoPD3) (16.56).

9.1. Null Object Exercise Walkthrough (12.11).

10. Iterator Pattern (GoF), (27:31).

10.1. Iterator Pattern Exercise Walkthrough (9.44)

11. Factory Method (GoF & Refactoring) (27.40)

12. Template Method Pattern (GoF), (11:15).

12.1. Template Method exercise (8:17)

13. Composite Pattern (GoF), (12:33).

13.1. Composite Exercise Walkthrough (17.20)

14. Visitor Pattern (GoF), (17:28).

14.1. Visitor Exercise Walkthrough (8.06).

15. Acyclic Visitor Pattern, PLoPD3, (12:52)

15.1. 5.01. Acyclic Visitor Exercise Walkingthrough

16. Object Recursion Model (PLoPD4) (9.04).

17. Default Visitor Type (PLoPD3) (19.47)

17.1. Walkthrough of the Default Visitor Exercise (12:52).

18. Adapter Pattern, GoF (21:54).

18.1. Adapter exercise walkthrough (12:19).

19. Command Pattern (GoF, 14:24)

19.1. Command Exercise 1 Walkthrough (5.31)

19.2. Command Exercise 2 Walkthrough (2.10)

20. Decorator Pattern (GoF), 28:54

20.1. Decorator Exercise Walkthrough (11.31)

21. Extension Object Pattern (34.09)

22. Singleton pattern (GoF) (40/50)

22.1. Singleton Exercise 1, Walkthrough (0:58).

22.2. Singleton Exercise 2 Walkthrough (1.33)

22.3. Singleton Exercise 3. Walkthrough (14.21)

23. State Pattern (GoF). (24:47).

23..1. State Exercise Walkthrough (20.27)

24. Facade Pattern (GoF) (11:15)

24.b. Session Facade Pattern (JEE) (3:41)

25. Prototype (17.11).

26. Abstract Factory Pattern (10:29)

26.1. Abstract Factory Exercise Walkthrough (5.14)

27. Interpreter Pattern (GoF) (16:20)

27.1. 27.1

28. Mediator Pattern (GoF), 13:03

29. Observer pattern (GoF) (28.13)

29.1. Observer Exercise Walkthrough (8.20).

30. Bridge Pattern (GoF), 13:44

30.1. Bridge Exercise Walkthrough (10.07).

31. Chain of responsibility pattern (GoF), (10:35).

31.1. 31.1.

32. Conclusion (9.44)

“Revision of patterns I knew before, and learning of new patterns. Learning new Java features in the exercises. Best practices, like using ConcurrentHashMap. Learned useful new IntelliJ shortcuts. Live coding sessions by Heinz.”

Anonymous, Feedback from an insider-House course in Graz, Austria
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“Pattern advantages / disadvantages in contrast with later Java versions (lots of small objects are not so expensive now…) Exercises were fun. Example unit test gave good direction towards solutions. Liked the structure checking tests.”

Anonymous, Feedback from an insider-House course in Graz, Austria

Your instructor

Dr Heinz M. Kabutz
Dr Heinz M. Kabutz

Heinz Kabutz The author of The Java Specialists’ Newsletter, a publication enjoyed by tens of thousands of Java Experts in more than 145 countries. His book “Dynamic Proxies (in German)” was #1 Bestseller on Amazon.de in Fachbücher für Informatik for about five minutes until Amazon fixed their algorithm. He now has 5 copies, thanks to the support of his mother.

Heinz’s Java Specialists’ newsletter is filled with amusing anecdotes of life on the Island of Crete. He is a well-known speaker at all the best Java He speaks at conferences all over the globe, as well as at the worst. He teaches Java Courses in classrooms around world where his main objective is to ensure that his students do not fall asleep. He doesn’t always succeed.

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