examples of design patterns

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Design Patterns
Book by Erich Gamma
Design Patterns: Elements of Reusable Object-Oriented Software is a software engineering book describing software design patterns. The book was written by Erich Gamma, Richard Helm, Ralph Johnson, and…
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Original titleDesign Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley Professional Computing Series)
Originally publishedJanuary 1, 1994
Author Erich Gamma
GenreProgramming · Computer Science · Technology · Software · Technical · Nonfiction · Coding · Reference · Computers · Engineering
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Read to understand patterns, but please think for yourself when you code.
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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 …
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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:http://groups.google.com/group/comp.l...Perhaps design patterns are worth looking into after all, just not in this book.
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[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 t…
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[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 …
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