To remove all the elements in the list in the following code, replace the underlined blank space with __________.

Question

```
import java.util.*;

public class Test {
public static void main(String[] args) {
______________ list = new ArrayList<>();
list.add(0);
list.add(1);
list.add(2);

for (int i = 0; i < 3; i++) {
list.remove(i);
}
System.out.println(list);
}
}
```
a. Collection
b. List
c. ArrayList
d. AbstractList

Answer 1

a If list is declared as Collection, list.remove(i) is the same as list.remove(new Integer(i)). If list is declared as List, ArrayList, or AbstractList, list.remove(i) is to remove the element at the index i. The list has three elements and the last index is 2 . After removing the first element, the last index becomes 1 . After removing another element, the last index becomes 0 . You will receive an IndexOutOfBoundsException.