Adapter mode and appearance mode for design mode

First, the adapter mode:

　　Adapter Mode , simply say " to what mountain, sing what song ", that it solves is incompatible , mismatch problem. Let's start with a small example: what should we do when we want to plug a three-phase plug into a two-phase socket? Of course, to find a three-phase two-phase adapter socket, in this example, the role of the adapter socket is to change the interface of the socket to meet the needs of three-phase plug; again, in the OO adapter mode we're going to introduce, the adapter is to convert an interface into another interface to meet the needs of the customer .

Let's use the code to illustrate this example. We first put out the Plugoftwo and plugofthree two interfaces, indicating the two-phase socket and three-phase socket macro abstraction, the specific entity class are to achieve the corresponding interface (two-phase sockets and three-phase sockets have Plug method Plug and Start power supply method offer, but its working principle is different, So the name is also different). The code is as follows:

1  Public Interface plugoftwo {2     3      Public void plugwithtwo (); 4 5      Public void offerwithtwo (); 6 }

two-phase socket macro Interface

1  Public Interface Plugofthree {2     3      Public void Plugwiththree (); 4 5      Public void Offerwiththree (); 6 }

three-phase socket macro Interface

The following two classes are implementation classes of two interfaces, the code is as follows:

1  Public classTwoplugentityImplementsPlugoftwo {2 3      Public voidPlugwithtwo () {4System.out.println ("Two-phase receptacle solid is plugged in ...");5     }6 7      Public voidOfferwithtwo () {8System.out.println ("Two-phase receptacle body starts to power ...");9     }Ten}

Two-phase socket implementation class

1  Public classThreeplugentityImplementsPlugofthree {2 3      Public voidPlugwiththree () {4System.out.println ("three-phase receptacle solid is plugged in ...");5     }6 7      Public voidOfferwiththree () {8System.out.println ("three-phase receptacle entity starts to power ...");9     }Ten}

three-phase socket implementation class

Let's test the code below:

1  Public classMainClass {2     3      Public Static voidMain (string[] args) {4         //Test the operation of three-phase sockets5Threeplugentity three =Newthreeplugentity ();6 Three.plugwiththree ();7 Three.offerwiththree ();8         //Test the operation of two-phase sockets9TwoplugentityNewtwoplugentity ();Ten two.plugwithtwo (); One two.offerwithtwo (); A     } -}

Test Code

Test results

In the above example, our problem is that a three-phase plug should be plugged into a two-phase socket, so we need to add an adapter. The code for the adapter is as follows:

1  Public classTwotothreeadapterImplementsPlugofthree {2     PrivatePlugoftwo;3 4      PublicTwotothreeadapter (plugoftwo) {5          This. both =both ;6System.out.println ("The three-phase socket has been fitted to the two ...");7     }8 9      Public voidPlugwiththree () {Ten two.plugwithtwo (); One     } A  -      Public voidOfferwiththree () { - two.offerwithtwo (); the     } -}

the code of the adapter

The code for the second Test:

1  Public classMainClass {2     3      Public Static voidMain (string[] args) {4         //Test the operation of three-phase sockets5Threeplugentity three =Newthreeplugentity ();6 Three.plugwiththree ();7 Three.offerwiththree ();8         //Test the operation of two-phase sockets9TwoplugentityNewtwoplugentity ();Ten two.plugwithtwo (); One two.offerwithtwo (); A         //test the socket after adding the adapter work condition -Twotothreeadapter adapter =NewTwotothreeadapter (both); - Adapter.plugwiththree (); the Adapter.offerwiththree (); -     } -}

the code for the second Test

Test results

To be Continued ...

Adapter mode and appearance mode for design mode