Can we create an instance of an interface in Java? [duplicate]

Question

Is it possible to create an instance of an interface in Java?

Somewhere I have read that using inner anonymous class we can do it as shown below:

interface Test {     public void wish(); }  class Main {     public static void main(String[] args) {         Test t = new Test() {             public void wish() {                 System.out.println("output: hello how r u");             }         };         t.wish();     } } 

cmd> javac Main.java cmd> java Main output: hello how r u 

Is it correct here?

Answer 1

You can never instantiate an interface in java. You can, however, refer to an object that implements an interface by the type of the interface. For example,

public interface A { } public class B implements A { }  public static void main(String[] args) {     A test = new B();     //A test = new A(); // wont compile } 

What you did above was create an Anonymous class that implements the interface. You are creating an Anonymous object, not an object of type interface Test.