(Java)Given an unsorted array of integers and an integer K, return K-th largest number in the array.

Example: For a give array as :

[10, 20, 15, 40, 80, 97, 26, 18, 92]

If K is 1, K-th largest number is First largest number or the maximum, the function must return 97

If K is 3, 3rd largest number or 80 must be returned.

If K is 7, 7th largest number which is 18 must be returned.