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Benx Shen

Patterns in action - 0 views

www-128.ibm.com/...krebs

design pattern turotial

shared by Benx Shen on 18 Sep 07 - Cached
  • General Responsbility Assignment Software Patterns (GRASP)
  • Rational Software Architect (RSA)
  • The GoF pattern template, for example, has Name and Classification, Intent, Also Known As, Motivation, Applicability, Structure, Participants, Collaborations, Consequences, Implementation, Sample Code, Known Uses and, last but not least, Related Patterns.
  • ...5 more annotations...
  • service-oriented architectures (SOA)
  • Business modeling patterns as well as architectural/network patterns motivated through an SOA can drive pattern-driven development top-down, whereas the pattern-driven application design prepares a successful SOA bottom-up.
  • Object-oriented software engineering (OOSE) without design patterns is like cooking without a recipe.
    • Benx Shen
      Benx Shen on 22 Oct 07
       
      這裡使用了很好的一個大廚做菜做為比喻。 大廚精通做菜的各個步驟，但只需要「用嘴做菜」，交代各個學徒分別該做什麼樣的工作，比如說：洗菜、將洋蔥切丁等等。 這也是軟體工程的基礎，General Responsbility Assignment Software Patterns (GRASP)，也就是如何分派責任與工作。
  • Finding a matching pattern for a problem not only presents a solution to a problem, but also means in many cases the beginning of a new search and further evaluation of related patterns.
Benx Shen

Groovy - Regular Expressions - 0 views

groovy.codehaus.org/Regular+Expressions

groovy regexp

shared by Benx Shen on 14 Jun 07 - Cached
  • Groovy supports regular expressions natively using the ~"pattern" expression
    • Benx Shen
      Benx Shen on 14 Jun 07
       
      Groovy 對於 regexp 的支援有 3 個特殊的表示方式：
      ~"pattern" (create java.util.regex.Pattern)=~ (create java.util.regex.Matcher)==~ (do Matcher.matches() )
  • // lets create a regex Pattern def pattern = ~/foo/ assert pattern instanceof Pattern
  • Groovy also supports the =~ (create Matcher) and ==~ (matches regex) operators.
  • ...6 more annotations...
  • Since a Matcher coerces to a boolean by calling its find method, the =~ operator is consistent with the simple use of Perl's =~ operator, when it appears as a predicate (in 'if', 'while', etc.). The "stricter-looking" ==~ operator requires an exact match of the whole subject string.
  • def matcher = "\$abc." =~ /\$(.*)\./ // no need to double-escape! assert "\\\$(.*)\\." == /\$(.*)\./ matcher.matches(); // must be invoked assert matcher.group(1) == "abc" // is one, not zero
  • def m = "foobarfoo" =~ /o(b.*r)f/ assert m[0][1] == "bar"
  • // lets create a Matcher def matcher = "cheesecheese" =~ /cheese/ assert matcher instanceof Matcher answer = matcher.replaceAll("edam")
    • Benx Shen
      Benx Shen on 14 Jun 07
       
      以下是一些 groovy regexp 的程式碼，請特別注意劃線的部份！
  • // fancier group demo matcher = "\$abc." =~ "\\\$(.*)\\." matcher.matches(); // must be invoked [Question: is this still true? Not in my experience with jsr-04.] assert matcher.group(1) == "abc" // is one, not zero
    • Benx Shen
      Benx Shen on 16 Jun 07
       
      這裡需要特別注意的是，如果想要使用 matcher.group() 方法，那麼必須先執行 matcher.matches() 方法呼叫（我記得呼叫 find() 也行）。然而，如果是直接使用 groovy 的語法，那麼就可以直接使用 matcher[0][?] 的用法了！
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Benx Shen

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*精華* oo 物件導向

shared by Benx Shen on 12 Jun 07 - Cached
  • 面向對象編程思想的提出已經不是幾年而是幾十年了，考查其思想的變化，一方面是對現有語言的一些評判，另一方面，也算是對前輩計算機科學家的緬懷。 ——題記 Kristen Nygaard在1962年發明的 Simula 語言現在被認同為世界上第一種明確實現面向對象編程中某些"必要"元素（比如 class）的語言。Simula 是從 Algol 發展來的，可以說，是一種增加了 class 這個數據類型的 Algol，並將參數傳遞的默認模式從"按名調用"換成了"按引用調用"，還提出了根據類型確定初始化過程的方法。 從 Simula 的時代開始，科學家們在解決軟件複雜度方面的思路開始"異常開闊"——當然也有資深的老派牛人們不這麼認為。比方說 Peter Norvig，寫了Design Patterns in Dynamic Programming一書來反駁。他認為設計模式早已體現在以 Lisp 為首的一批語言中了，根本不需要什麼面向對象。但我還是跟從偶像 Alan Kay 的觀點。某些時候，把一種特定的編程風格做進語言裡也是必要的。
Benx Shen

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design java pattern programming singelton

shared by Benx Shen on 14 Jun 07 - Cached
  • public class Something { private Something() { } private static class LazyHolder { private static final Something something = new Something(); } public static Something getInstance() { return LazyHolder.something; } }
    • Benx Shen
      Benx Shen on 14 Jun 07
       
      Singleton pattern 終極解法！
  • Benx Shen on 14 Jun 07
     
    Java Singlton 模式的終極解決之道！
  • Benx Shen on 14 Jun 07
     
    對了會發現這篇文章，是因為 http://www.eclipsezone.com/eclipse/forums/t97263.rhtml 這裡討論在 eclipse 裡如何使用最簡單的步驟創建一個 singlton 類別設計。
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