Given a sample code:

1 class Ball {
2 abstract void sayHello();
}

3 class Football extends Ball {
4 void sayHello() {
5 System.out.println("hello");
6 }}

7 public class Sample2 {
8 public static void main(String args[]) {
9 Football f = new Football();
10 f.sayHello();
11 }}

What is the correct statement for the line number 1 ?

(1) Compilation succeeds no issue
(2) abstract
(3) interface
(4) public

Answer

(2)

Explanations:

 The abstract keyword must be place before the class Ball because abstract method can only exist in the abstract class not in concrete class.

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