(vi) Object-oriented design principles of the second

A Brief introduction:
Command mode: The command pattern is divided into "requestor of the Command" and "Implementation of the Command". Make the request for the command and the implementation complete understanding decoupling.

Two Example:

 Cook = $cook;    Public Function Execute () {$this->cook->meal ();    }}class Drinkcommand implements command{private $cook;    Public function __construct (Cook $cook) {$this->cook = $cook;    Public Function Execute () {$this->cook->drink ();    }}/* * Simulation class */class cookcontrol{private $mealCommand;    Private $drinkCommand;        Public Function AddCommand (command $mealCommand, command $drinkCommand) {$this->mealcommand = $mealCommand;    $this->drinkcommand = $drinkCommand;    Public Function Callmeal () {$this->mealcommand->execute ();    Public Function Calldrink () {$this->drinkcommand->execute (); }} $control = new Cookcontrol (), $cook = new Cook; $mealCommand = new Mealcommand ($cook); $drinkCommand = new Drinkcommand ($co OK); $control->addcommand ($mealCommand, $drinkCommand); $control->callmeal (); $control->calldrink ();

Three Principle of Use:

1. Refine the business process according to the business process. Step-by-step abstraction until ' appropriate '.
2. The classification of responsibilities requires attention.

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