Java design pattern--structural mode--Decorative mode

1 Decoration Mode2 Overview3 add some extra responsibilities to an object dynamically. For added functionality, the decorator mode is more flexible than generating subclasses. 4     5     6 Applicability71add responsibilities to a single object in a dynamic, transparent manner without affecting other objects. 8 92. Handle the duties that can be undone. Ten  One3When you cannot expand by using methods that generate subclasses.  A participants -1. Component - defines an object interface that can dynamically add responsibilities to these objects.  the  -2. Concretecomponent - defines an object that can add some responsibility to the object.  -  +3. Decorator - maintains a pointer to the component object and defines an interface that is consistent with the component interface.  +  A4. Concretedecorator atAdd responsibilities to the component.

Test class:

1  Public classTest {2 3      Public Static voidMain (string[] args) {4Man mans =NewMan ();5Mandecoratora MD1 =NewMandecoratora ();6Mandecoratorb MD2 =NewMandecoratorb ();7         8 Md1.setperson (man);9 Md2.setperson (MD1);Ten md2.eat (); One     } A}

 1  public  interface   person { 2  3   Eat ();  4 } 

1  Public class Implements Person {23      Public void eat () {4         System.out.println ("Men are eating"); 5     }6 }

1  Public Abstract classDecoratorImplementsPerson {2 3     protectedperson person ;4     5      Public voidSetperson (person person) {6          This. person =Person ;7     }8     9      Public voideat () {Ten person.eat (); One     } A}

1  Public classMandecoratoraextendsDecorator {2 3      Public voideat () {4         Super. Eat ();5 reeat ();6System.out.println ("Mandecoratora class");7     }8 9      Public voidreeat () {TenSystem.out.println ("Eat Another Meal"); One     } A}

1  Public class extends Decorator {2     3      Public void eat () {4         Super . Eat (); 5         System.out.println ("==============="); 6         System.out.println ("Mandecoratorb class"); 7     }8 }

Use Daniel's code to take notes, learn to observe the continuous progress ... With so many frameworks, the source code is still not easy to understand AH

Java design pattern--structural mode--Decorative mode