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Collectors averagingLong () method in Java 8
The averagingLong() method of the Collectors class returns a Collector that produces the arithmetic mean of a long-valued function applied to the input elements.
The syntax is as follows
static <T> Collector<T,?,Double> averagingLong(ToLongFunction<? super T> mapper)
Here, the parameters
- T - Type of the input elements
- mapper - Function extracting the property to be summed
- Double - It wraps a value of the primitive type double in an object.
- ToLongFunction - A function that produces a long-valued result.
To work with Collectors class in Java, import the following package
import java.util.stream.Collectors;
The following is an example to implement averagingLong() method in Java
Example
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
Stream<String> stream = Stream.of("20", "50", "75", "100", "150", "200");
double res = stream.collect(Collectors.averagingLong(a -> Long.parseLong(a)));
System.out.println("Arithmetic Mean of the stream elements = "+res);
}
}Output
Arithmetic Mean of the stream elements = 99.16666666666667
Updated on: 30-Jul-2019
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