No.We cannot create instance for interface.But we can 
create reference to an interface.We can implement the 
interface by creating sub class(implementation class) and 
creat instance to the sub class, then you can create 
reference to the interface by assigning instance of sub 
class to the interface reference variable.

no.Interface is similar to class but they lack instance 
variable, their methods are declared with out any body. 
Interfaces are designed to support dynamic method 
resolution at run time. All methods in interface are 
implicitly 
abstract, even if the abstract modifier is omitted. 
Interface methods have no implementation;

Though it is correct that interfaces are basically used for 
obtaining the dynamic resoulution of the Method and they 
usually can not be instantiated but it is also possible to 
instantiate the same in case of anonymous classes and it 
works fine.......


class Amit 
{

         void addCode()
         {
               Runnable rr=new Runnable()
               {
                   public void run()
                   {
             System.out.print("This is Amit")             
          }
               };
            Thread tt=new Thread(rr);
             tt.start();
             
         }
}

class Check
{
    static public void main(String[]amit)
    {
             new Amit().addCode();
    }
}