Design pattern of the façade mode

façade mode definition: Requires that a subsystem's external communication with its internal must be done through a single object. Façade mode provides a high-level interface that makes subsystems easier to use.

Advantages:

1, reduce the interdependence of the system. Outside access does not have to go deep inside the subsystem.

2. Increased flexibility.

3, improve security.

Disadvantages:

The biggest disadvantage of the façade mode is that it does not conform to the opening and shutting principle.

The class diagram is as follows:

The implementation code is as follows:

Subsystem Class ClassA:

Package com.designpatterns.facade;/** * @author WSYW126 * @version May 6, 2016 PM 7:16:45 */public class ClassA {public void D Osomething () {System.out.println ("Cooking");}}

Subsystem class CLASSB:

Package com.designpatterns.facade;/** * @author WSYW126 * @version May 6, 2016 PM 7:16:45 */public class ClassB {public void D Osomething () {System.out.println ("eat");}}

Subsystem Class C:

Package com.designpatterns.facade;/** * @author WSYW126 * @version May 6, 2016 PM 7:16:45 */public class ClassC {public void D Osomething () {System.out.println ("Brush Bowl");}}

External Quondam role Facade class:

Package com.designpatterns.facade;/** * @author WSYW126 * @version May 6, 2016 PM 7:19:14 */public class Facade {ClassA A = NE W ClassA (); ClassB B = new ClassB (); ClassC C = new ClassC ();p ublic void Eat () {a.dosomething (); B.dosomething (); C.dosomething ();}}

Test class:

Package com.designpatterns.facade;/** * @author WSYW126 * @version May 6, 2016 PM 7:20:30 */public class Client {public static void Main (string[] args) {System.out.println ("I want to eat!") "); Facade F = new facade (); F.eat ();}}

This is the façade mode.

References :
The Zen of design pattern

Remark :
Reprint please indicate the source
http://blog.csdn.net/wsyw126/article/details/51334018
by WSYW126

Design pattern of the façade mode