oddElementSum.java

ppackage forEach;

public class ForEach {

	public static void main(String[] args) {
		int[] data1 = {1,2,3,4};
		System.out.println(oddElementSum(data1));
		int[] data2 = null;
		System.out.println(oddElementSum(data2));
		System.out.println(oddElementSum(new int[]{0}));
		System.out.println(oddElementSum(new int[]{-1,-1,-1,-1}));

	}

	
	
	private static long oddElementSum(int[] data){
		long sum = 0;
		if(data != null){
		for(int i = 0; i < data.length; i++){
			if(i%2 != 0){
				sum += data[i];
			}else continue;
		}
		}else sum = -1;
		return sum;
		
				}
	
	
}