Java 8 Streams Java Java API
Interface:
java.util.stream.DoubleStream
Methods:
These terminal operation performs a reduction
on the elements.
double reduce(double identity,
DoubleBinaryOperator op)
Parameters:
identity
- the identity value for the accumulating function
op
- a function for combining two values
OptionalDouble reduce(DoubleBinaryOperator op)
Parameters:
op
- a function for combining two values
Examples
 package com.logicbig.example.doublestream;
import java.util.stream.DoubleStream;
public class ReduceExample {
public static void main(String... args) {
DoubleStream ds = DoubleStream.of(1.0, 1.2, 2.0, 2.4, 3.0);
double d = ds.reduce(1, (a, b) -> a * b);
System.out.println(d);
}
}
Output17.28
package com.logicbig.example.doublestream;
import java.util.OptionalDouble;
import java.util.stream.DoubleStream;
public class ReduceExample2 {
public static void main(String... args) {
DoubleStream ds = DoubleStream.of(1.0, 1.2, 2.0, 2.4, 3.0);
OptionalDouble od = ds.reduce((a, b) -> a * b);
if (od.isPresent()) {
System.out.println(od.getAsDouble());
}
}
}
Output17.28
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