Extracting unique element(s) from a sorted list

PROBLEM: you have a list of sorted elements. All elements are sorted (it could be in ascending order or descending order). You are printing out the unique elements in the sorted list.
COMPLEXITY: O(n)

public class UniqueNumbers {
 public static void main(String[] args) {
  int a[]={1, 1, 1, 2, 4, 4, 7, 8, 9, 14, 14, 20, 20, 20};
  //int a[]={1};
  //int a[]={2, 2, 4, 5};
  //int a[]={1, 1, 1, 2, 2, 8};
  //int a[]={1, 1, 1};
  int uniq = a[a.length-1];
  boolean numberExists = false;
  for (int i = 0; i < a.length; i++) {
   if (a[i] == uniq) {
    if (!numberExists) {
     System.out.println("Position: " + i + " Unique Element => " + a[i]);
     numberExists = true;
    }
   }
   else {
    System.out.println("Position: " + i + " Unique Element => " + a[i]);
    uniq = a[i];
    numberExists = true;
   }
  }
 }
}

The output is shown below:

{1, 1, 1, 2, 4, 4, 7, 8, 9, 14, 14, 20, 20, 20}
Position: 0 Unique Element => 1
Position: 3 Unique Element => 2
Position: 4 Unique Element => 4
Position: 6 Unique Element => 7
Position: 7 Unique Element => 8
Position: 8 Unique Element => 9
Position: 9 Unique Element => 14
Position: 11 Unique Element => 20

{1}
Position: 0 Unique Element => 1

{2, 2, 4, 5}
Position: 0 Unique Element => 2
Position: 2 Unique Element => 4
Position: 3 Unique Element => 5

{1, 1, 1, 2, 2, 8}
Position: 0 Unique Element => 1
Position: 3 Unique Element => 2
Position: 5 Unique Element => 8

{1, 1, 1}
Position: 0 Unique Element => 1

Update: my solution is not that elegant after all. I had the opportunity to discuss the algorithm with Mark and he has a much better way to solve this problem. Thank you, Mark (you know who you are :D).

 public static void main(String[] args) {
  int a[]={1, 1, 1, 2, 4, 4, 7, 8, 9, 14, 14, 20, 20, 20};
  //int a[]={1};
  //int a[]={2, 2, 4, 5};
  //int a[]={1, 1, 1, 2, 2, 8};
  //int a[]={1, 1, 1};
  int uniq = a[0];
  System.out.println("Position: " + 0 + " Unique Element => " + uniq);
  for (int i = 1; i < a.length; i++) {
   if (a[i] != uniq) {
    System.out.println("Position: " + i + " Unique Element => " + a[i]);
    uniq = a[i];
   }
  }
 }