This topic is about Java 12 – Teeing Collectors.
Java 12 introduces a new method to Collectors to perform two different operations on collection and then merge the result. Folloiwng is the syntax of teeing method −
Collector<T, ?, R> teeing( Collector<? super T, ?, R1> downstream1, Collector<? super T, ?, R2> downstream2, BiFunction<? super R1, ? super R2, R> merger )
Here we are performing different functions on a collection and then merge the result using merger BiFunction.
Consider the following example −
ApiTester.java
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class APITester {
public static void main(String[] args) {
double mean
= Stream.of(1, 2, 3, 4, 5, 6, 7)
.collect(Collectors.teeing(
Collectors.summingDouble(i -> i), Collectors.counting(),
(sum, n) -> sum / n));
System.out.println(mean);
}
}
Output
4.0
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