Tag: technology

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Multiple choice technology programming languages

Question 5Given:10. interface Foo {}11. class Alpha implements Foo { }12. class Beta extends Alpha {}13. class Delta extends Beta {14. public static void main( String[] args) {15. Beta x = new Beta();16. // insert code here17. }18. }Which code, inserted at line 16, will cause ajava.lang.ClassCastException?

  1. B. Foo f= (Delta)x;

  2. A. Alpha a = x;

  3. D. The code on line 31 throws an exception.

  4. C. Foo f= (Alpha)x; D. Beta b = (Beta)(Alpha)x;
Reveal answer Fill a bubble to check yourself
A Correct answer
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