Design pattern-Template Method mode

Design pattern-Template method pattern

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Template method Pattern Definition

Define The skeleton of an algorithm in a operation,deferring some steps to Subclasses,template Method lets subclasses red Efine certain steps of an algorithm without changing the algorithm ' s structure.
Template method Pattern: Defines the skeleton of an algorithm in a method, and delays some steps into subclasses. The template method allows subclasses to redefine some of the steps in the algorithm without changing the structure of the algorithm.

Template Method Mode further introduction

The template pattern is really simple and uses only the Java integration mechanism, but it is a very wide-ranging pattern. Among them, Absstractclass (in the code below) is called abstract template, its methods are divided into two categories;

• Basic Methods
  The basic method is also called the basic operation, which is the method implemented by the subclass, and the template method is called.

• Template Method
  Can have one or several, is generally a concrete method, that is, a framework to implement the basic method of scheduling, complete the fixed logic.

• Code Listing Abstract template class

public abstract class  abstractclass  {//Basic method protected  abstract  void  dosomething  Span class= "Hljs-params" > () ; Basic method protected  abstract  void  doanything   () ; Template method public  void   Templatemethod   ()  {//Call the basic method, complete the related logic dosometh ing   () ; doanything   () ; }

• Code Listing Concrete Template classes

Publicclass ConcreteClass1 extends AbstractClass{    @Override    protected void dosomething(){//Business logic processing} @Override    protected void doanything(){//Business logic Processing}} Public class ConcreteClass2 extends AbstractClass{    @Override    protected void dosomething(){//Business logic processing} @Override    protected void doanything(){//Business logic Processing}}

• Code Listing Scenario Classes

Publicclass  client  {public  static  void  Span class= "Hljs-title" >main   (String [] args)  { class1  = new  concreteclass1   () ; abstractclass  class2  = new      ConcreteClass2   () ; Call the template method class1 . templatemethod      () ; class2 . templatemethod   () ;}} 

Design mode-Template method mode