Common design patterns-decorative patterns]

Decoration mode: as its name implies, it adds layers of coats with him, or adds more adjectives to an object.

Please refer to the demo to show you at a glance.

Package decorator;/*** @ description: decoration mode * @ author Potter * @ date 05:35:07 * @ version V1.0 */public class app {/*** @ Param ARGs */public static void main (string [] ARGs) {coffee = New Tang (New NaI (New Natie (); system. out. println ("coffee's cost =" + coffee. getcost (); system. out. println ("coffee's message =" + coffee. getmessage ());}}

Coffee class:

Package decorator;/*** @ Description: Coffee class * @ author Potter * @ date 05:21:35 * @ version V1.0 */public interface coffee {public float getcost (); public String getmessage ();}

Decoration core class:

Package decorator;/*** @ Description: decoration mode core * @ author Potter * @ date 05:21:14 * @ version V1.0 */public class decorator implements coffee {protected coffee; public decorator (coffee) {This. coffee = coffee ;}@ overridepublic float getcost () {return coffee. getcost () ;}@ overridepublic string getmessage () {return coffee. getmessage ();}}

Physical Blue Mountains coffee:

Package decorator;/*** @ Description: blue coffee * @ author Potter * @ date 05:25:46 * @ version V1.0 */public class lanshan implements coffee {@ overridepublic float getcost () {return 20f ;}@ overridepublic string getmessage () {return "lanshan coffee ";}}

Entity latte coffee:

Package decorator;/*** @ Description: Latte * @ author Potter * @ date 2012-9-10 05:23:53 * @ version V1.0 */public class Natie implements coffee {@ overridepublic float getcost () {return 10f ;}@ overridepublic string getmessage () {return "latte ";}}

Decorative Milk:

Package decorator;/*** @ Description: Milk * @ author Potter * @ date 05:33:13 * @ version V1.0 */public class Nai extends decorator {public NaI (coffee) {super (coffee) ;}@ overridepublic float getcost () {return Super. getcost () + 5 ;}@ overridepublic string getmessage () {return "Milky" + super. getmessage ();}}

Decorative SUGAR:

Package decorator;/*** @ Description: sugar * @ author Potter * @ date 05:30:49 * @ version V1.0 */public class tang extends decorator {public Tang (coffee) {super (coffee) ;}@ overridepublic string getmessage () {return "SWEETENED" + super. getmessage ();}}

Running result:

Coffee's cost = 15.0
Coffee's message = latte with sugar and milk

Haha ~ It's easy to understand!