Question

1.Which of the following class definitions defines a legal abstract class?a. class A { abstract void unfinished() { } }b. class A { abstract void unfinished(); }c. abstract class A { abstract void unfinished(); }d. public class abstract A { abstract void unfinished(); }

Answer 1

Answer:(c) abstract class A { abstract void unfinished(); }

Explanation:

A legal abstract class must have the keyword abstract before the class and an abstract class has abstract functions with the keyword abstract written and a void as the return type.