in java

Given a set of data, output the middle item (if even number of items, output the two middle items). Assume that the data set will always contain less than 20 items.

Ex: If the input is 5 7 9 11 13 -1 (a negative indicates end), the output is:

9 

Ex: If the input is 5 7 9 11 -1, the output is:

7 9 

Hint: First read the data into an array. Then, based on the array's size, find the middle item(s).