[Digital Imagi Processing] Really stuck at this question. Can anyone help me!

Median filter replaces the value of the center pixel by the median of the intensity values in the neighborhood of that pixel (the value of the center pixel is included in computing the median). The median is the middle number in a sorted, ascending or descending, list of numbers and can be more descriptive of that data set than the average. If there is an odd amount of numbers, the median value is the number that is in the middle, with the same amount of numbers below and above. If there is an even amount of numbers in the list, the middle pair must be determined, added together, and divided by two to find the median value. For example, the median of the set of values {2, 3, 8, 20, 21, 25, 31} is 20. the median of the set of values {2, 3, 8, 20, 22, 23, 25, 31} is 21. Write a Java program to compute the median of an arbitrary array arr. Hint: you may use Arrays.sort(int[] a) method. Please fill in the following code in // TODO. public class Median { public int calcMedian(int arr[]) { //TODO: please write your code here } }