How to calculate sum of array elements in Java

In today's coding problem, we'll see how to write a program to calculate the sum of array elements in Java. You need to write a method which will accept an integer array and it should return total sum of all the elements. The array could contain both positive and negative numbers but only decimal numbers are allowed. The array can also be null or empty so make sure your solution handle those as well. In the case of a null or empty array, your program can throw IllegalArgumentException. The empty array means, an array whose length is zero or there is no element inside it. Well, that's enough for the requirement of this simple coding problem. The solution is really simple, just loop through the array and keep adding elements into sum until you process all the elements.

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