Interface cannot be instantiated

Today, when I look at the template method design pattern, we find that in the interface callback, the anonymous class has a new interface. Thought it was weird, and I wrote a little program to test it.

// Hibernatecallback is an interface  Public void Saveuser (final  user user) {        execute (new  hibernatecallback () {              public Object Doinsession (Session session) {                session.save (user);                 return NULL ;            }        });    }

Here is the test code

 Public Interfaceinterface{voidprint ();} Public classTest {Static voidUpdateUser () {Execute (NewInterface () {@Override Public voidprint () {System.out.println ("I am an Interface");    }                    }); }          Static voidExecute (Interface i) {i.print (); }         Public Static voidMain (string[] args) {updateUser (); }}    

The output is:  I am an interface

Anti-compilation files for anonymous classes

From the anti-compilation file is not a new interface, but this anonymous class implementation of the interface, and then passed on as a parameter of the past.

Interface cannot be instantiated