Design Patterns-Template methods

Template

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1. Countable noun

A template is a thin piece of metal or plastic which are cut into a particular shape. It's used to help you cut wood, paper, metal, or other materials accurately, or to reproduce the same shape many times.

Trace around your template and transfer the design onto a sheet of card.

2. countable noun [usually singular]

If One thing is a template for something else, the second thing are based on the first thing.

The deal is likely-provide a template for other agreements. [+ for]

As can be seen from the above definition, the template is not directly available, but is used to produce the tools available, the production of things and templates have the same shape.

There are many scenes in life that use the idea of a template:

For example: poster template, download a beautifully styled poster template, the personalized content of which to be promoted information, then a beautiful poster quickly produced.

For the above example: poster template, the entire mold is unchanged, for any of the generated posters, the overall style is consistent;

This template is open for users to modify the section, generally using XXX annotations, which belong to the template placeholder, need to replace the user with their own information.

Poster Template---Abstract

The user-made poster---is specific and inherits the overall styling style of the poster template.

Template method

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The template method Gof is defined by defining the skeleton of the algorithm in a method, deferring some steps to its subclasses. Such as:

AbstractClass is primarily a skeleton of an algorithm that defines an operation, and some steps are deferred to subclasses. Templatemethod allows subclasses to redefine some specific steps of the algorithm without altering the structure of an algorithm. This is a bit like a "hook" in C, while porting the common code to Templatemethod, which implements the common code.

Understanding: The template method is an abstract method, this method does not work directly, because in fact, there are several methods in this method that are not implemented,

This method, which needs to be implemented in a subclass.

Thus by the following relationship:

Abstract class------Define template methods && define virtual methods (abstract functions called in template methods)

The skeleton of the program algorithm is constructed as a template method, which belongs to the high level abstract logic.

Concrete classes------virtual methods that implement abstract class definitions, and each specific subclass has a different virtual method implementation.

Design Patterns-Template methods