Adapter Adapter Mode

Adapter Design Pattern Overview
Transforms the interface of one class into another interface that the customer wants. So that an interface that could not be called directly becomes callable

Advantages:
Make interfaces that are not intended for use suitable for use

Disadvantages:
Can only fit one class at a time, with certain limitations

 PackageCom.adapter; Public InterfaceUserdao { Public voidAdd ();  Public voidDelete ();  Public voidChange ();  Public voidfind ();} PackageCom.adapter;/** This is not very good, because I only need an add function, but because of the implementation of the interface, the interface is too many methods, I have to implement every abstract method. */ Public classUserdaoimplImplementsUserdao {@Override Public voidAdd () {System.out.println ("Add Action"); } @Override Public voidDelete () {} @Override Public voidChange () {} @Override Public voidfind () {}} PackageCom.adapter; Public classUseradapterImplementsUserdao {@Override Public voidAdd () {//TODO auto-generated Method Stub} @Override Public voidDelete () {//TODO auto-generated Method Stub} @Override Public voidChange () {//TODO auto-generated Method Stub} @Override Public voidfind () {//TODO auto-generated Method Stub    }} PackageCom.adapter;/** Using the adapter mode, the implementation class does not need to implement all the abstract methods, only need to use the method to rewrite it*/ Public classUserDaoImpl2extendsUseradapter {@Override Public voidAdd () {System.out.println ("New Action"); }} PackageCom.adapter; Public classUserdemo { Public Static voidMain (string[] args) {Userdaoimpl UI=NewUserdaoimpl ();        Ui.add (); USERDAOIMPL2 Ui2=NewUserDaoImpl2 ();    Ui2.add (); }}

Adapter Adapter Mode