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separate policy pattern. You only need to provide the name of the policy when you need to verify it. Just like this:Nameinput.addvalidata ({ true, true, += { function (value) { return value!== '; } ,function(value, MaxLen) { return value.length () > maxlen; As you can see, various validation rules are easily modified and replaced with each other. If one day the Product manager recommends that the character be too long, the limit is changed to 60 characters. It only t

Policy mode: defines the algorithm family, which is encapsulated separately so that they can replace each other. This mode allows algorithm changes to be independent of algorithm customers.Simple Factory: completely independent object creation, so that object creation is irrelevant to specific users. A simple factory is not strictly a design pattern, but a good programming habit. Glossary: The Factory model can be understood as follows. Suppose there

, comparator),NewPerson ("C", 173, 66, Comparator)}; sort (persons); //Sorting persons by sorting algorithmSystem.out.println (arrays.tostring (persons)); } Public Static voidsort (person[] persons) { for(inti=0; i) { for(intj=0; j) {person P1=Persons[j]; Person P2= Persons[j+1]; if(P1.compareto (p2) > 0) {Persons[j]=P2; Persons[j+1] =P1; } } } }}View CodeOK, the requirements have been fulfilled. The answer is yes, according to how tall and how weight can be

, each of which has different property values;b) A class it needs to create several kinds of objects, each of which is a subclass of a parent class/interface;The policy class created by the policy mode can only be the second one, and all subclasses must have a common function so that the contextinterface () Call of the context class.The role of the policy model:1. After using the policy mode, if you need to add a policy, you just need to create a subclass that implements the

implementing the different, he can call all the methods in the same way, reducing the coupling between the various algorithm classes and using the algorithm class. On the other hand, it is easy to define the algorithm classes individually, as well as unit tests, because they can be individually tested by their own algorithms. In practice, not only can encapsulation algorithms, but also can be used to encapsulate almost any type of rules, in the analysis process need to apply different business

=NewCash_normal (); Break; Case' 300-100 ':$cs=NewCash_return (300, 100); Break; Case' 0.8 ':$cs=NewCash_rebate (0.8); Break; } return $cs; }}$csuper= Cash_factory::create_cash_accept (' 300-100 ');$total _price=$csuper->accept_cash (30000);Echo $total _price;Combination of strategy and simple Factory mode:classCash_context {Private $cs=NULL; Public function__construct ($type) { Switch($type) { Case' Normal ':$this->cs =New

[] args) {//Select and create the policy object you want to useDiscountstrategy Discountstrategy =NewIsmemberdiscountstrategy (); //Create an environmentCalculatedprice Calculatedprice =NewCalculatedprice (discountstrategy); //Calculate PriceCalculatedprice.quote (300); }}Advantages of the policy model(1) The Strategy mode provides a way to manage the associated algorithm families. The hierarchy structure of a policy class defines an algorithm or a fa

Article Description: The interface design specification reflects Apple's focus on the design and development quality of iOS applications, enabling Third-party developers to work hard to meet the high expectations of users. The interface design specification reflects Apple's focus on the design and developme

Price * 0.5; else if (PersonType = = ' old ') { Span style= "color: #008000;" >// old customer 30 percent return Price * 0.3; else { return Price; // All other full price We look at the above as a class, if we want to expand a price method, we have to add a new else if, or modify an algorithm logic, you need to modify an if or else if, this is a single class modification, and this situation will often change this class, This violates a principle of the

square. To represent the coverage method, the dominoes are numbered.#include 7 "Round robin CalendarThere are n=2k players competing to design a match schedule that meets the requirements:(1) Each contestant must compete with the other n-1 players once;(2) Each contestant can only race once a day.According to this request, the tournament schedule can be designed as a two-dimensional table of n-row n-1 columns, where section I of row J indicates the c

: PublicDuck3 {4 Public:5 voidDisplay () {std::cout "--redheadduck--"Std::endl;}6Redheadduck () {Set_fly_behavior (Newflywithwings ()); }7};RubberDuck.h1#include"FlyNoWay.h"2 3 classRubberduck: PublicDuck4 {5 Public:6 voidDisplay () {std::cout "--rubberduck--"Std::endl;}7 voidQuack () {std::cout "--squeak--"Std::endl;}8Rubberduck () {Set_fly_behavior (NewFlynoway ()); }9};Another look at the Flybehavior class and its subclassesFlyBehavior.h1 #include 23class flybehavior4{ 5 Publi

Policy Mode, encapsulating a specific set of behaviors and algorithms into classes to accommodate certain contexts, a pattern that Policy Mode， Policy ModeFor the free switching and expansion of the algorithm, it is widely used Design PatternsOne. The policy mode is used for the free switching and expansion of the algorithm, which is one of the most widely used design patterns. The policy pattern corresp

Edward on 2016/7/9.3 */4 Public Abstract classCharacter {5 protectedWeaponbehavior weapon;6 Public Abstract voidfight ();7 Public voidSetweapon (Weaponbehavior weapon)8 {9 This. Weapon =weapon;Ten } One}Weaponbehavior.java1 /** 2 * Created by Edward on 2016/7/9. 3 */ 4 Public Interface Weaponbehavior {5 void useweapon (); 6 }King.java1 /**2 * Created by Edward on 2016/7/9.3 */4 Public classKingextendsCharacter {5 @Override6 Public voidfight () {7