Answer / john

@Uday Ur fooling amateur coders by creating an anonymous
class within the class . U cannot create an instance of an
Interface .If so try to make execute this code lol class

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

Answer / shanmukha

Hi,
We can't create instance for an interface or abstract
class.Just remove the following code from the program
written by Uday.
interface Test
{
public void wish();
}
Remove the above code and run the program,then program will
compile and execute properly,because he used anonymous class.

Answer / sushma

hi nishant,
whatever the explanation u have given is exactly right. we cant create an instance for interface. the instance created is for annonymous inner class and not of interface Test.

Answer / tathagata

hi uday
I also tried this to call a interface of Collection and try
to instantiated but it is not working.
import java.util.*;
interface Test
{
public void wish();
}
class a implements Test
{
public void wish()
{
System.out.println("I am fine");
}
}
class Main
{
public static void main(String[] args)
{
Collection c =new Collection()
{
boolean isEmpty()
{
return true;
}
};
System.out.println(c.isEmpty());
Test t=new Test()
{
public void wish()
{
System.out.println("output:
hello how r u");
}
};
if(t instanceof Test)
{
System.out.println("t is a instance
of Test");
}
t.wish();
a oba=new a();
oba.wish();
}
}


But it is not working please explain.

Answer / ravikiran

No we can create an instance of a class which implements
this interface.

Answer / anthony

cool buddy. Nice way to fool people.

If you really need to check the concept, put the code in
eclipse or netbeans and see. The method in the anonymous
class would show as overriden from interface Test and if
you remove the method from the anonymous class, it would
not compile. So at the end you are having an instance of
class implementing the interface.

Answer / rasmitha

No,But we can Create reference for interface.
For Example.

java.sql.Connection is an interface,But in the
Establishmentof the Database Connetion.

Connection con = DriverManager.getConnetion();

con is an ref Varieble that holds Connetion Object yar..

Answer / venkat

No, we can't instantiate the interface

Answer / cps

@ Uday... nice way to fool around...


Check <
http://java.sun.com/docs/books/tutorial/java/IandI/interfaceAsType.html
>

Answer / bibhuti

i am bit confused with this one.
If it is referring to an anonymous class then if i am changing like below then why it is not working?

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

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