Java Decorative design pattern

pass an object as a parameter and then wrap the object --- change the method or add some new behavior --- the decorative design pattern --- Decorator mode ---decorate model

Change a method:

1. by inheriting this class, and then overriding the method

2. create decorative objects by passing objects, and re-provide the corresponding methods in the decoration class
Disadvantages of Inheritance:

1. Single Inheritance

2. create a parent class object using the up shape, you can call the overridden method in the subclass, cannot use the original method in the parent class

3. if the parent object already exists, you cannot use the overridden method in the subclass

Disadvantages of decorative Design patterns:

may increase the redundancy of the code --- proxy mode

1 //Man's interface2  Public InterfacePerson {3 4     voideat ();5 6     voidsleep ();7 8 }9 Ten  One //Star of the realization class A  Public classStarImplementsPerson { -  -@SuppressWarnings ("Unused") the     PrivatePerson p; -  -      PublicStar (person p) { -          This. P =p; +     } -  + @Override A      Public voideat () { atSystem.out.println ("The Star eats the wild vegetables ~ ~ ~"); -     } -  - @Override -      Public voidsleep () { -System.out.println ("Bed count stars ~ ~ ~"); in     } -  to } +  - //Worker Realization Class the  Public classWorkerImplementsPerson { *  $ @OverridePanax Notoginseng      Public voideat () { -SYSTEM.OUT.PRINTLN ("The workers eat a good meal ~ ~ ~ and then eat one months of soil ~ ~ ~"); the     } +  A @Override the      Public voidsleep () { +System.out.println ("Bed count stars ~ ~ ~"); -     } $  $ } -  - //packaging workers into stars, but essentially workers or workers the  Public classPersondemo { - Wuyi      Public Static voidMain (string[] args) { the  -Worker p =NewWorker (); Wu  - p.eat (); About  $Star s =NewStar (p); -  - s.eat (); -  A p.eat (); +  the     } -  $}

Java Decorative design pattern