Why Compilation fails here???

[Joe San]

Hi Guys,

I want to know why the compilation fails here in the code below,

Given:
1. interface Beta {}
2.
3. class Alpha implements Beta {
4. String testIt() {
5. return �Tested�;
6. }
7. }
8.
9. public class Main1 {
10. static Beta getIt() {
11. return new Alpha();
12. }
13. public static void main( String[] args ) {
14. Beta b = getIt();
15. System.out.println( b.testIt() );
16. }

Thanks in advance.

[Sanjeev Singh]

Your interface should know about the method that is being invoked on it(line 15).Either define the method in the interface as shown
Change the code as

interface Beta {
  String testIt();
}

or downcast the b into Alpha

public static void main( String[] args ) {
   Beta b = getIt();
 [B]System.out.println( ((Alpha)b).testIt() );[/B]
}