java8-tutorial/src/com/winterbe/java8/Streams4.java at master · stevencoding/java8-tutorial · GitHub

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package com.winterbe.java8;

import java.util.OptionalInt;
import java.util.stream.IntStream;

/**
 * @author Benjamin Winterberg
 */
public class Streams4 {

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            if (i % 2 == 1) {
                System.out.println(i);
            }
        }

        IntStream.range(0, 10)
            .forEach(i -> {
                if (i % 2 == 1) System.out.println(i);
            });

        IntStream.range(0, 10)
            .filter(i -> i % 2 == 1)
            .forEach(System.out::println);

        OptionalInt reduced1 =
            IntStream.range(0, 10)
                .reduce((a, b) -> a + b);
        System.out.println(reduced1.getAsInt());

        int reduced2 =
            IntStream.range(0, 10)
                .reduce(7, (a, b) -> a + b);
        System.out.println(reduced2);
    }
}