ElementSum.java

package masiv;

public class ElementSum {

	public static void main(String[] args) {
	
		int [] data={1,10,5,7,6};
		int [] data1={0,0};
		int [] data2={};
		int [] data3={0,0,15,25,16};
		int [] data4={-3,25,2,1,5,9};
		int [] data5={6137654,2000000000,9474634,2000000000,3739642};
		int [] data6={5};
		
		System.out.println(oddElementSum(data ));
		System.out.println(oddElementSum(data1));
		System.out.println(oddElementSum(data2));
		System.out.println(oddElementSum(data3));
		System.out.println(oddElementSum(data4));
		System.out.println(oddElementSum(data5));
		System.out.println(oddElementSum(data6));
		
	}
	static long oddElementSum(int []data)
	{
		if (data==null || data.length<2)
		   return -1;
		
		long sum=0;
		
		for(int i=1;i<data.length;i+=2)
			sum+=data[i];
		
		return sum;
	}

}