AverAge.java

package forEach;

public class AverAge {


	public static void main(String[] args) {
		int[] data = {1,2,3,4};
		System.out.println(average(data));
		int[] data2 = null;
		System.out.println(average(data2));
		System.out.println(average(new int[0]));
		System.out.println(average(new int[]{-1,-10,-1,-1}));
	}

	private static double average(int[] data){
		double sum = 0;
		if(data == null || data.length == 0){
			System.out.print("heh");
			return  -1;
			
			} 
		for(int i: data){
			 sum+=i;	
			}
			sum = sum/data.length;
		return sum;
	}
}