hi i am naive to java ,started learing java.and I have question "Interface does not"

[REBEL]

contain any implementations.then what is the use of instantiating them?.For example in jdbc API Connection is an interface.then why do we create connection object .what exactly happens when connection interface is instantiated.can you please elaborate on it.I have been breaking my head over this.please help me with this
Thank you.

[JosAH]

contain any implementations.then what is the use of instantiating them?.For example in jdbc API Connection is an interface.then why do we create connection object .what exactly happens when connection interface is instantiated.can you please elaborate on it.I have been breaking my head over this.please help me with this

As a matter of fact, you don't create a Connection object (you even can't do that), but you ask something else to create it; that something else creates an object of a class that implements the Connection interface. All you care about is that it implements the Connection interface; you don't care at all what class had delivered the object. It's the database vendor that is responsible for the details and it can change them at will as long as their object implements the Connection interface.

kind regards,

Jos

[REBEL]

Thank you very much josah for your explanation.