Object Oriented Programming (OOPs)

Question : 44 of 72

Marks: +1, -0

Given:

1. interface Foo {}
2. class Alpha implements Foo {}
3. class Beta extends Alpha {}
4. class Delta extends Beta {
5.   public static void main( String[] args ) {
6.    Beta x = new Beta();
7.    /*insert code here*/
8.   }
9. }

Which code, inserted at line 7, will cause a java.lang.ClassCastException?

Alpha a = x;
Foo f = (Delta)x;
Foo f = (Alpha)x;
Beta b = (Beta)(Alpha)x;

Validate

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