JAVA EE: Terminal operations[reduce] in Java 8 Stream

Thursday 24 August 2017

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Terminal operations[reduce] in Java 8 Stream | Streams in Java 8

StreamReduceDemo.java

import java.util.Arrays;
import java.util.List;

public class StreamReduceDemo
{
    public static void main(String[] args)
    {
        List<Integer> numberList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);

        /*
         * reduce processes all elements of the stream and produces a
         * single result.
         */
        numberList.stream().reduce((i1, i2) -> i1 > i2 ? i1 : i2)
                .ifPresent(i -> System.out.println("max: " + i));

        Integer total = numberList.stream().reduce(0,(i1, i2) -> i1 + i2);

        System.out.println("total: " + total);
    }
}