代理模式只是代理,所代理的对象可以有类的父子关系,但是只有一个类对象. // Decorator pattern -- Real World example using System;using System.Collections;namespace DoFactory.GangOfFour.Decorator.RealWorld{ // MainApp test application class MainApp { static void Main() { // Create book Book book ...
该例子演示了通过装饰模式为图书馆的图书与录像带添加"可借阅"装饰。 //Decorator pattern -- Real World example usingSystem; usingSystem.Collections; //"Component" abstractclassLibraryItem { //Fields privateintnumCopies; //Properties publicintNumCopies { get {returnnumCopies; } set { numCopies=value...
UML diagram of Decorator Pattern Here is the UML class diagram of the decorator design pattern. You can see that we have aComponentinterface, which is used to createConcreteComponents. In our real-world example,Sandwichis a component interface andWhiteBreadSandwichis a concrete component. ...
Real-World Decorator Use Case: Caching The lru_cache decorator is a built-in tool in Python that caches the results of expensive function calls. This improves performance by avoiding redundant calculations for repeated inputs. Example: from functools import lru_cache @lru_cache(maxsize=128) def...
The important aspect of this pattern is that it lets decorators appear anywhere aTTextStreamcan appear. This way clients generally can’t tell the difference between a decorated component and an undecorated one, so they don’t depend at all on the decoration. In the example, the client doesn’...
The idea is so simple that you will feel like a child in drawing classes: there are two pencils (red and blue); you draw a line with the blue pencil inside the object you want to select (for example, yourself on a group photo), and with the red pencil - some lines outside the ...
Real-world example Imagine a coffee shop where you can customize your coffee order. You start with a basic coffee, and you can add different ingredients like milk, sugar, whipped cream, and so on. Each addition is like a decorator in the Decorator design pattern. The base coffee object can...
The important aspect of this pattern is that it lets decorators appear anywhere aTTextStreamcan appear. This way clients generally can’t tell the difference between a decorated component and an undecorated one, so they don’t depend at all on the decoration. In the example, the client doesn’...