The java.util.Calendar and java.util.GregorianCalendar classes are introduced in Chapter 11. Analyze the following code. Which of the following statements is correct?

Question

```
import java.util.*;
public class Test {
public static void main(String[] args) {
Calendar[] calendars = new Calendar[10];
calendars[0] = new Calendar();
calendars[1] = new GregorianCalendar();
}
}
```
a. The program has a compile error on Line 4 because java.util.Calendar is an abstract class.
b. The program has a compile error on Line 5 because java.util.Calendar is an abstract class.
c. The program has a compile error on Line 6 because Calendar[1] is not of a GregorianCalendar type.
d. The program has no compile errors.

Answer 1

b. The program has a compile error on Line 5 because java.util.Calendar is an abstract class.
(A) is incorrect since it is OK to use abstract class as data type for arrays. new Calendar[10] does not create Calendar objects. It just creates an array with 10 elements, each of which can reference to a Calendar object. (B) is correct since you cannot create an object from an abstract class. (C) is incorrect since it is fine to create a GregorianCalendar object and assign its reference to a variable of its superclass type.