Design patterns(JNTUH): Elements of Reusable Object -

Design patterns(JNTUH): Elements of Reusable Object - Oriented Software for JNTU ➛ [KINDLE] ❅ Design patterns(JNTUH): Elements of Reusable Object - Oriented Software for JNTU By Erich Gamma ➥ – Thomashillier.co.uk Design Patterns is a modern classic in the literature of object oriented development, offering timeless and elegant solutions to common problems in software design It describes patterns for managing o Design Patterns Elements of PDF/EPUB Á is a modern classic in the literature of object oriented development, offering timeless and elegant Design patterns(JNTUH): ePUB ½ solutions to common problems in software design It describes patterns for managing object creation, composing objects into larger patterns(JNTUH): Elements of MOBI õ structures, and coordinating control flow between objects The book provides numerous examples where using composition rather than inheritance can improve the reusability and flexibility of code Note, though, that it s not a tutorial but a catalog that you can use to find an object oriented design pattern that s appropriate for the needs of your particular application a selection for virtuoso programmers who appreciate or require consistent, well engineered object oriented designs.


About the Author: Erich Gamma

Erich Gamma Elements of PDF/EPUB Á is a Swiss computer scientist and co author of the influential software engineering textbook, Design Design patterns(JNTUH): ePUB ½ Patterns Elements of Reusable Object Oriented Software.



10 thoughts on “Design patterns(JNTUH): Elements of Reusable Object - Oriented Software for JNTU

  1. Adnan Ali Adnan Ali says:

    Read to understand patterns, but please think for yourself when you code.


  2. Michael Michael says:

    I know this is an unpopular opinion, but I think the concept of a design pattern is just this side of bogus Part of the issue is that the languages the industry has chosen have weak powers of abstraction and thus these patterns seem necessary Perhaps it s becoming a cliche or became one 10 years ago , but I m sure some haven t yet been exposed to this thought in a decent language like Lisp, most of these design patterns are trivial The patterns are only there to make up for the problems wi I know this is an unpopular opinion, but I think the concept of a design pattern is just this side of bogus Part of the issue is that the languages the industry has chosen have weak powers of abstraction and thus these patterns seem necessary Perhaps it s becoming a cliche or became one 10 years ago , but I m sure some haven t yet been exposed to this thought in a decent language like Lisp, most of these design patterns are trivial The patterns are only there to make up for the problems with the languages of choice.For me another issue is that the idea of design patterns is firmly linked in my brain with absurd Java APIs that require me to deal with XYZManagers and ABCHandlers and twenty different classes all for something that anyone sane would have just provided a handful of simple functions for On the other hand, this post by Richard Gabriel is interesting design patterns are worth looking into after all, just not in this book


  3. Noah Coad Noah Coad says:

    A must have primer for any developer working with object oriented code While it was a decent read from front to back though a bit long , it is evenuseful as a reference Some of the terms are outdated by today s coding conventions, but the principles still apply and it is a fair exercise in mentally converting between the lingo used in the book and what you may be familiar with in C , Java, or another OOP One interesting aspect is that you can immediately start to see what programming p A must have primer for any developer working with object oriented code While it was a decent read from front to back though a bit long , it is evenuseful as a reference Some of the terms are outdated by today s coding conventions, but the principles still apply and it is a fair exercise in mentally converting between the lingo used in the book and what you may be familiar with in C , Java, or another OOP One interesting aspect is that you can immediately start to see what programming patterns you re already using today in the frameworks and libraries you may be using on a daily basis Putting a name to these design patterns, such as Factory, Command, etc helps to identify them and understand them so you as a developer know when best to apply them to your own code Certainly worth having on any OOP software developer s bookshelf


  4. Darcey Darcey says:

    Note This is a reference book I didn t actually read it cover to cover I did read the first two chapters in full though For the last couple years, I ve been working as a software engineer, and I ve found myself getting very confused by a lot of our Java code Why do we use dependency injection What s a factory and why do we need them It felt like everyone else on my team had gotten some memo that I didn t receive.It turns out that everyone else on my team did get some memo that I didn t Note This is a reference book I didn t actually read it cover to cover I did read the first two chapters in full though For the last couple years, I ve been working as a software engineer, and I ve found myself getting very confused by a lot of our Java code Why do we use dependency injection What s a factory and why do we need them It felt like everyone else on my team had gotten some memo that I didn t receive.It turns out that everyone else on my team did get some memo that I didn t receive, and that memo was this book.This book describes the concept of design patterns, which are broad overarching ways of structuring your code Design patterns are not about ensuring syntactic or algorithmic correctness rather, they re about writing your code in a way that makes it easily extensible, restructurable, and maintainable A design pattern is not something like use for loops for iteration that s just a specification of the syntactic structure of the language And, as far as I understand, test your code using unit tests is not a design pattern since it s not really about code structure , just a good testing practice.An example of a design pattern is something like using a factory to make new instances of an object Suppose you have some interface Foo, and an implementation of it called FooImpl And suppose you frequently need to create new instances of this You could pepper your code with Foo foo new FooImpl , but then suppose you wrote a new, better implementation of the Foo interface called FooImplImproved or something You would have to find each instance of new FooImpl and replace it with new FooImplImproved This is a pain So instead, you could create an object called FooFactory which returns instances of Foo Then you could do something like Foo foo FooFactory.create This create method would then just contain return new FooImpl Then, when you wanted to change FooImpl to FooImplImproved, you would only have to change it in one place in the FooFactory.create method.I think I would have benefited from encountering this book in college, before I ever worked as a professional software engineer But I wouldn t have fully understood or appreciated it then I still don t fully understand it, but now that I ve worked in industry, I have a much better understanding of the need for maintainable code.This book definitely changed how I think of programming software engineering And, if I m understanding correctly, back when this book came out, it changed how everyone thought about software engineering As far as I know, this book introduced the concept of a design pattern The book tells you about all sorts of different design patterns, but I think the main impact of the book was not teaching people individual design patterns, but introducing them to the concept of a design pattern altogether Once you have that concept, you can identify and use new design patterns easily The specific design patterns presented are certainly useful, but the concept itself isimportant.Also, in the spirit of reading the history of philosophy backwards , this book taught me a lot about what was known about software engineering back in the early 90s, just based on what it felt like it needed to explain to its audience One thing that surprised me was that it went out of its way to explain the separation into interface based inheritance and implementation based inheritance I d always taken that distinction for granted, because it s built into Java, which was my first language But I realized, after reading this book, that the distinction between implementing an interface and inheriting an implementation was not always obvious And in C , that distinction is not a syntactic feature, but merely a design pattern Which makes me wonder what it would look like if OO languages incorporatedof these design patterns into their syntax Anyway, program to the interface, not the implementation was something I had only learned since starting at this job it s not something that was covered during my undergrad education So I was glad this book went out of its way to emphasize its importance.Anyway, this book absolutely gets 5 stars, for introducing me and also the rest of the software engineering world to a new conceptual framework that allows software engineers to do a much better job I expect that I will return to this book very often and will always view it as a useful resource


  5. Erika RS Erika RS says:

    Design Patterns is a very important reference and its contents are also important, but it is a rather dull book to read This is mainly because the bulk of the book contains a catalog of patterns Like most catalogs, it works better when you come to it looking for something specific.I have two main criticisms of the patterns themselves, both of which stemfrom the time the book was written than from any inherent problems with the patterns First, each pattern contains a list of benefits and Design Patterns is a very important reference and its contents are also important, but it is a rather dull book to read This is mainly because the bulk of the book contains a catalog of patterns Like most catalogs, it works better when you come to it looking for something specific.I have two main criticisms of the patterns themselves, both of which stemfrom the time the book was written than from any inherent problems with the patterns First, each pattern contains a list of benefits and consequences This section never considers the pattern from the view point of testability This is a pity because most of the patterns, in my opinion, serve to make the relevant components easier to test.Aserious complaint is that many of the patterns show their age by suggesting implementation inheritance as a good way of implementing these patterns While implementation inheritance still has its place in the programmer s toolbox, current wisdom shies away from using it merely because it is convenient Instead, current belief leanstoward preferring interfaces in the Java sense of only defining operations and not implementations and reserves implementation inheritance for when it provides a tangible benefit.That said, most of the patterns still have a useful core, even if some of the details of pattern structure or implementation should be modified to fit better into common practice Just remember though, if you want to read through it you need will power or a reading group preferably both


  6. Matt Hooper Matt Hooper says:

    This is the classic software design patterns book.Much of this material is assumed knowledge in many development shops so a understanding of this book is very valuable However, there seems to be a design pattern mania and some developers take the information in this book a bit too literally and assume these patterns are inflexible The patterns themselves are of value but the bigger take away from this book is how to solve problems with object oriented languages This is an excellent resource f This is the classic software design patterns book.Much of this material is assumed knowledge in many development shops so a understanding of this book is very valuable However, there seems to be a design pattern mania and some developers take the information in this book a bit too literally and assume these patterns are inflexible The patterns themselves are of value but the bigger take away from this book is how to solve problems with object oriented languages This is an excellent resource for developers looking to familiarize themselves with common design techniques.This book verges on being a reference Forof a guide, check out Head First Design Patterns see my review


  7. Milhouse Van Houten Milhouse Van Houten says:

    Capturing a wealth of experience about the design of object oriented software, four top notch designers present a catalog of simple and succinct solutions to commonly occurring design problems Previously undocumented, these 23 patterns allow designers to createflexible, elegant, and ultimately reusable designs without having to rediscover the design solutions themselves.


  8. Daniel Daniel says:

    I d recommend this book to any Object Oriented programmer who wants to be even remotely familiar with the approaches being used to write production systems these days The Design Pattern based approach to software engineering has definitely caught on, and if you aren t familiar with at least the basic patterns, you need to be not only to they make logical sense, but real development teams use the pattern names often, in discussions amongst multiple developers, to describe the systems conce I d recommend this book to any Object Oriented programmer who wants to be even remotely familiar with the approaches being used to write production systems these days The Design Pattern based approach to software engineering has definitely caught on, and if you aren t familiar with at least the basic patterns, you need to be not only to they make logical sense, but real development teams use the pattern names often, in discussions amongst multiple developers, to describe the systems concepts etc being discussed If you re not familiar with them, then you ll quickly get lost in the conversation, et al There are other books on J2EE patterns, or Unit Test Patterns, etc but, you need to be familiar with the basics first, and THIS IS THE BOOK Commonly reffered to as the GoF or Gang of Four Book, this is one hard cover that you MUST HAVE ON YOUR BOOKSHELF , period


  9. Steve Steve says:

    Ahhhh design patterns Most software engineers have probably used several of the patterns in this book without even realizing it Still, I found it to be a useful validation of some of my design approaches as well as a valuable resource for streamlining my design Reading it cover to cover will put any software architect in a position to solve many design issues faster than they may have otherwise.


  10. Ahmed Salem Ahmed Salem says:

    Beautiful Book for very complicated topic for developers and software architects I liked the first chapter of introduction very much and one of the best trends I have learned from this book is that, You don t have to use all design patterns in the software you are making, just use what you think it is useful for the current situation and purpose of the current software you are working on now.


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