I have two Long array elements and both have some values
Long[] firstArray = new Long[10]; Long[] secondArray = new Long[25];
Both the array may or may not be equal in size.
firstArray[0] = new Long("1");
firstArray[1] = new Long("2");
firstArray[2] = new Long("3");
secondArray [0] = new Long("2");
secondArray [1] = new Long("3");
I want to compare the secondArray with firstArray and create a new thirdArray with the values which are not in secondArray.
In the above example the thirdArray will have only 1
Answer
One possible solution would be to convert both of your arrays to List and use removeAll:
Long[] firstArray = new Long[10];
Long[] secondArray = new Long[25];
firstArray[0] = new Long("1");
firstArray[1] = new Long("2");
firstArray[2] = new Long("3");
secondArray [0] = new Long("2");
secondArray [1] = new Long("3");
List<Long> first = new ArrayList<>(Arrays.asList(firstArray));
List<Long> second = Arrays.asList(secondArray);
first.removeAll(second);
Long[] thirdArray = first.toArray(new Long[first.size()]);