Java 8 Streams - DoubleStream.reduce 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);
    }
}

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());
        }
    }
}