Question

I have two arrays

 String[] ID1={"19","20","12","13","14"};

 String[] ID2={"10","11","12","13","15"};  

How can I get following answer while comparing above two arrays.

I want to exclude common elements while comparing above two arrays.

 String[] Result={"14","15","19","20","10","11"};

Answer 1

Seems like you want the union of the two sets (no duplicates, right?) minus the intersection:

Set<Integer> union = new HashSet<Integer>(Arrays.asList(ID1));
union.addAll(Arrays.asList(ID2);

Set<Integer> intersection = new HashSet<Integer>(Arrays.asList(ID1));
intersection.retainAll(Arrays.asList(ID2);

union.removeAll(intersection);

// result is left in "union" (which is badly named now)

(I changed your String to Integer, which seems to fit the data better, but it would work with String the same way)