How do you return the total number of positive items in non-null 2d array of data and return 0 if data is null or empty and how do you return the total number of negative items in non-null 2d array of data and return 0 if data is null or empty. I cannot use inbuilt libraries or hardcode either question

public int totalNumberOfPositiveItems(int[][] data) { return 0; //to be completed }

public int totalNumberOfNegativeItems(int[][] data) { return 0; //to be completed }