Template method for behavioral design patterns

Structure
Intention	Defines the skeleton of an algorithm in an operation, and delays some steps into subclasses. Te m P L a t e m e t h o D allows subclasses to redefine some specific steps of the algorithm without altering the structure of an algorithm.
Applicability	One-time implementation of an invariant part of the algorithm, and the variable behavior is left to subclass to achieve. The public behavior in each subclass should be extracted and centralized into a common parent class to avoid code duplication. This is a good example of the "re-decomposition to generalize" described by O p D y k e and J o h n s o n [o J 9 3]. First identify the differences in the existing code and separate the differences into new operations. Finally, replace these different code with a template method that invokes these new operations. Controls the subclass extension. The template method invokes the "H o O K" operation only at a specific point (see the Effects section) so that only those points are allowed to be extended.

1 usingSystem;2 3     classalgorithm4     {5          Public voidDoalgorithm ()6         {7Console.WriteLine ("In doalgorithm");8             9             //Do some part of the algorithm hereTen              One             //Step1 goes here AConsole.WriteLine ("In algorithm-doalgostep1");  -             // . . .  -  the             //Step 2 goes here -Console.WriteLine ("In Algorithm-doalgostep2");  -             // . . .  -  +             //Now call configurable/replacable part - DoAlgoStep3 (); +  A             //Step 4 goes here atConsole.WriteLine ("In algorithm-doalgostep4");  -             // . . .  -  -             //Now call Next configurable part - DoAlgoStep5 (); -         } in  -         Virtual  Public voidDoAlgoStep3 () to         { +Console.WriteLine ("In algorithm-doalgostep3");  -         } the  *         Virtual  Public voidDoAlgoStep5 () $         {Panax NotoginsengConsole.WriteLine ("In algorithm-doalgostep5");  -         } the     } +  A     classCustomalgorithm:algorithm the     { +          Public Override voidDoAlgoStep3 () -         { $Console.WriteLine ("In customalgorithm-doalgostep3"); $         } -  -          Public Override voidDoAlgoStep5 () the         { -Console.WriteLine ("In customalgorithm-doalgostep5");Wuyi         } the     } -  Wu     /// <summary> -     ///Summary description for Client. About     /// </summary> $      Public classClient -     { -          Public Static intMain (string[] args) -         { ACustomalgorithm C =Newcustomalgorithm (); +  the c.doalgorithm (); -  $             return 0; the         } the}

Template Method

Template method for behavioral design patterns