"Go learning note" 12, Interface interface

This is a creation in Article, where the information may have evolved or changed.

Interface interface

• An interface is a collection of one or more method signatures
• As long as a type has all the method signatures for that interface, that interface is implemented, without showing which interface the declaration implements, which is called Structural Typing
• Interface as long as method declaration, no implementation, no data field
• Interfaces can be embedded anonymously in other interfaces, or embedded in a structure
• When an object is assigned to an interface, a copy occurs, and the interface stores a pointer to the replica that cannot modify the state of the replica or retrieve the pointer
• The interface is equal to nil only if the interface stores both the type and the object are nil
• Interface calls do not automatically convert receiver
• Interface also supports anonymous field methods
• Interfaces can also be implemented to resemble the polymorphism in OOP
• An empty interface can be used as a container for any type of data

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typeUsbInterface{Name ()stringConnector}typeConnectorInterface{Connect ()}typePhoneconnectorstruct{Namestring} func (PC Phoneconnector) Name() string {returnPc.name} func (PC Phoneconnector) Connect() {FMT. Println ("Connect:", Pc.name)} func main () {A: = phoneconnector{"Phoneconnector"}a.connect () Disconnect (a)//Strong turnA: = phoneconnector{"Phoneconnector"}varP Connectorp = Connector (a) p.connect ()} func Disconnect(USB usb) {ifPc,ok: = USB. (Phoneconnector); OK {fmt. Println (Pc.name)return}fmt. Println ("Unknown Device")}