Java OCA OCP Practice Question 337

Question

What is the result of the following code? 

import java.util.ArrayList;
import java.util.List;

public class Main {
   public static void main(String args[]) {
      int[] array = { 6, 9, 8 };
      List<Integer> list = new ArrayList<>();
      list.add(array[0]);/*w  ww. j a  v  a 2  s.  c o m*/
      list.add(array[2]);
      list.set(1, array[1]);
      list.remove(0);
      System.out.println(list);

   }
}
  • A. [8]
  • B. [9]
  • C. Something like [Ljava.lang.String;@123rew12
  • D. An exception is thrown.
  • E. The code does not compile. 


B.

Note

The array is allowed to use an anonymous initializer because it is in the same line as the declaration.

The ArrayList uses the diamond operator allowed since Java 7.

This specifies the type matches the one on the left without having to re-type it.

After adding the two elements, list contains [6, 8].

We then replace the element at index 1 with 9, resulting in [6, 9].

We remove the element at index 0, leaving [9].

Option C is incorrect because arrays output something like that rather than an ArrayList.




PreviousNext

Related