Java Array Average Calculation In Java, calculating the average of an array involves summing up all its elements and dividing the total by the number of elements. Using a for loop or the Arrays.stream(array).average() method, you can easily compute the result. For example, int sum = 0; for (int num : array) { sum += num; } double average = (double) sum / array.length;. This program is a fundamental example of array manipulation and is widely used in data analysis and mathematical computations.