java.util.stream.DoubleStream in Java 8, deals with primitive doubles. It helps to solve the old problems like finding maximum value in array, finding minimum value in array, sum of all elements in array, and average of all values in array in a new way. DoubleStream average() returns an OptionalDouble describing the arithmetic mean of elements of this stream, or an empty optional if this stream is empty. If any recorded value is a NaN or the sum is at any point a NaN then the average will be NaN.
OptionalDouble average() Where, OptionalDouble is a container object which may or may not contain a double value.
Note : The average returned can vary depending upon the order in which values are recorded. Elements sorted by increasing absolute magnitude tend to yield more accurate results.
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