Query on interface concept

Question

Class A{}
Interface I{}
public Class B
Public static void main ( String[] xx)
A a = new A();
I ii = a; // it doesn?t ..
I i = (I) a ; // it works WHY?
// why this code compiles ?

Answer 1

newbie_007 wrote:
Class A{}
Interface I{}
public Class B
Public static void main ( String[] xx)
A a = new A();
I ii = a; // it doesn?t ..
I i = (I) a ; // it works WHY?
// why this code compiles ?public class B
public static void main ( String[] xx)
A a = new A();
A ii = a; // it doesn?t ..
I i = (I) a ; // it works WHY?
class A{}
interface I{}
but this compiles and I wonder too. But when I run it, it throus
Exception in thread "main" java.lang.ClassCastException: A cannot be cast to I
     at B.main(B.java:15)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
interesting.
Edited by: Tiko_dev on Apr 30, 2009 7:11 AM