Support Forums: Message List - Dr Heinz Kabutz on the Strategy Pattern with Generics http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Fri, 24 May 2013 19:42:51 -0400 The reason for Generics and Patterns http://www.theserverside.com/discussions/thread.tss?thread_id=39454 What are the reasons for Generics?Java is a type-safe language. This means you define types during development and the compiler will verify those types. Types improve the communication of the design and allow more of the correctness of...]]> Fri, 24 Mar 2006 04:59:44 -0500 Fri, 24 Mar 2006 04:59:44 -0500 Fri, 24 Mar 2006 04:59:44 -0500 Mar 24, 2006 Paul de Vrieze 0 Recursive generics -"bizarre?" http://www.theserverside.com/discussions/thread.tss?thread_id=39454
TaxPayer<T is this.class>

Or actually remove the type completely from the class definition and implicitly into the class by allowing this.class to be a...]]> Fri, 24 Mar 2006 04:33:48 -0500 Fri, 24 Mar 2006 04:33:48 -0500 Fri, 24 Mar 2006 04:33:48 -0500 Mar 24, 2006 Paul de Vrieze 0 Do what creates certainty. http://www.theserverside.com/discussions/thread.tss?thread_id=39454 Maybe I'm missing something, but hmmm.... we do need to have bunch of if statements or utilize a Factory Pattern. The reason I'm asking is that I'm never sure of the best way to do something like this. In the end, all my creator classes end...]]> Fri, 24 Mar 2006 04:09:57 -0500 Fri, 24 Mar 2006 04:09:57 -0500 Fri, 24 Mar 2006 04:09:57 -0500 Mar 24, 2006 Paul de Vrieze 0 javadocs http://www.theserverside.com/discussions/thread.tss?thread_id=39454 Do you also comment your test cases, Cameron? That is where I draw the line.You mean you don't?

That's odd.

I certainly feel the need to comment my tests *less* than regular code, but comments certainly come in...]]> Mon, 20 Mar 2006 02:03:59 -0500 Mon, 20 Mar 2006 02:03:59 -0500 Mon, 20 Mar 2006 02:03:59 -0500 Mar 20, 2006 Cedric Beust 0 javadocs http://www.theserverside.com/discussions/thread.tss?thread_id=39454 JavaDoc is a great investment. We have always JavaDoc'd everything .. even all fields, private methods, and test code.Couldn't agree...]]> Mon, 20 Mar 2006 01:58:52 -0500 Mon, 20 Mar 2006 01:58:52 -0500 Mon, 20 Mar 2006 01:58:52 -0500 Mar 20, 2006 Cedric Beust 0 javadocs http://www.theserverside.com/discussions/thread.tss?thread_id=39454
Goodness me, to date I have not had the priviledge of seeing a single commercial application which had a complete set of JavaDocs.
JavaDoc is a great investment. We have always JavaDoc'd everything .. even all...]]> Mon, 20 Mar 2006 00:45:27 -0500 Mon, 20 Mar 2006 00:45:27 -0500 Mon, 20 Mar 2006 00:45:27 -0500 Mar 20, 2006 Heinz Kabutz 1 javadocs http://www.theserverside.com/discussions/thread.tss?thread_id=39454 Goodness me, to date I have not had the priviledge of seeing a single commercial application which had a complete set of JavaDocs.
JavaDoc is a great investment. We have always JavaDoc'd everything .. even all fields,...]]> Sun, 19 Mar 2006 21:49:50 -0500 Sun, 19 Mar 2006 21:49:50 -0500 Sun, 19 Mar 2006 21:49:50 -0500 Mar 19, 2006 Cameron Purdy 3 Cat in a box http://www.theserverside.com/discussions/thread.tss?thread_id=39454 You can cast assign a parameter List<? super Cat> to an object of type List<Animal> without any compiler warnings.
Hmm...how do you do that. I get:

"cannot convert from List<capture-of ? super...]]> Sun, 19 Mar 2006 17:55:32 -0500 Sun, 19 Mar 2006 17:55:32 -0500 Sun, 19 Mar 2006 17:55:32 -0500 Mar 19, 2006 greg matthews 0 Cat in a box http://www.theserverside.com/discussions/thread.tss?thread_id=39454 That is flatly not true. List<? super Cat> is a List which you can put Cats into. You have no idea what is in there already.
In this case, wouldn't you likely only be interested in the Cat methods/properties of objects...]]> Sun, 19 Mar 2006 17:34:40 -0500 Sun, 19 Mar 2006 17:34:40 -0500 Sun, 19 Mar 2006 17:34:40 -0500 Mar 19, 2006 greg matthews 0 Guessing types of Generics http://www.theserverside.com/discussions/thread.tss?thread_id=39454
JavaDoc certainly helps, when people actually use it! Goodness me, to date I have not had the priviledge of seeing a single commercial application which had a complete set of JavaDocs. I even wrote a Sun, 19 Mar 2006 13:25:05 -0500 Sun, 19 Mar 2006 13:25:05 -0500 Sun, 19 Mar 2006 13:25:05 -0500 Mar 19, 2006 Heinz Kabutz 0 Guessing types of Generics http://www.theserverside.com/discussions/thread.tss?thread_id=39454 JavaDoc certainly helps, when people actually use it! Goodness me, to date I have not had the priviledge of seeing a single commercial application which had a complete set of JavaDocs. I even wrote a Sat, 18 Mar 2006 06:47:15 -0500 Sat, 18 Mar 2006 06:47:15 -0500 Sat, 18 Mar 2006 06:47:15 -0500 Mar 18, 2006 Matthias Ernst 1 Taxonomies http://www.theserverside.com/discussions/thread.tss?thread_id=39454
the DAO does use the Strategy pattern.

Let's say that you had a hierarchy of Data Objects, and you wanted the DAO system to be in place from the root object.

You could then define a DAO interface at the top level with create...]]> Sat, 18 Mar 2006 02:04:51 -0500 Sat, 18 Mar 2006 02:04:51 -0500 Sat, 18 Mar 2006 02:04:51 -0500 Mar 18, 2006 Heinz Kabutz 0 Taxonomies http://www.theserverside.com/discussions/thread.tss?thread_id=39454
Example: You have base classes for houses, cars and people. You have blue cars owned by blue people who drive blue cars...]]> Fri, 17 Mar 2006 18:04:31 -0500 Fri, 17 Mar 2006 18:04:31 -0500 Fri, 17 Mar 2006 18:04:31 -0500 Mar 17, 2006 Lee Meador 1 Switch and Goto http://www.theserverside.com/discussions/thread.tss?thread_id=39454
1) When the conditions for the "switch" are similar in important ways, it is easy to use polymorphism to replace the "switch" statement.

2) Java's switch statement only allows conditions that are pure...]]> Fri, 17 Mar 2006 15:30:49 -0500 Fri, 17 Mar 2006 15:30:49 -0500 Fri, 17 Mar 2006 15:30:49 -0500 Mar 17, 2006 Lee Meador 2 Interfaces/Plugins http://www.theserverside.com/discussions/thread.tss?thread_id=39454 Nor a "Generics specialist" --> Oxymoron?
Obviously not. I do hope that was a joke!
I don't trust the esteemed professor's coding talent if he even wrote code that had that many switch statements in it in...]]> Fri, 17 Mar 2006 14:41:20 -0500 Fri, 17 Mar 2006 14:41:20 -0500 Fri, 17 Mar 2006 14:41:20 -0500 Mar 17, 2006 Radu-Adrian Popescu 0