Java8-Stream-No.06

import java.io.IOException;

import java.math.BigDecimal;

import java.util.Arrays;

import java.util.stream.IntStream;

import java.util.stream.Stream;

public class Streams6 {

    public static void main(String[] args) throws IOException {

        test1();

        test2();

        test3();

        test4();

    }

    private static void test4() {

        Stream

            .of(new BigDecimal("1.2"), new BigDecimal("3.7"))

            .mapToDouble(BigDecimal::doubleValue)

            .average()

            .ifPresent(System.out::println);

    }

    private static void test3() {

        IntStream

            .range(0, 10)

            .average()

            .ifPresent(System.out::println);

    }

    private static void test2() {

        IntStream

            .builder()

            .add(1)

            .add(3)

            .add(5)

            .add(7)

            .add(11)

            .build()

            .average()

            .ifPresent(System.out::println);

    }

    private static void test1() {

        int[] ints = {1, 3, 5, 7, 11};

        Arrays

            .stream(ints)

            .average()

            .ifPresent(System.out::println);

    }

}
巴特西

Java8-Stream-No.06

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