please help me write this in java

thank you

Write a method double median(int[] a) that returns the median. A median is the middle value of a sorted data set. Half of the data points is below the median and half of the data points is above the median. For example, the median of the array [1,2,3,4,5] is 3 . The value three is in the middle of the array. The index for the median in this example is 5/2=2. You may assume that the data size is always odd. If the array is not sorted, you can sort it with Arrays.sort(array). Test your method