Java8-Stream-No.08



import java.util.Arrays;

import java.util.stream.IntStream;

import java.util.stream.Stream;

public class Streams8 {

    public static void main(String[] args) {

        Arrays.asList("a1", "a2", "a3")

            .stream()

            .findFirst()

            .ifPresent(System.out::println);

        Stream.of("a1", "a2", "a3")

            .map(s -> s.substring(1))

            .mapToInt(Integer::parseInt)

            .max()

            .ifPresent(System.out::println);

        IntStream.range(1, 4)

            .mapToObj(i -> "a" + i)

            .forEach(System.out::println);

        Arrays.stream(new int[] {1, 2, 3})

            .map(n -> 2 * n + 1)

            .average()

            .ifPresent(System.out::println);

        Stream.of(1.0, 2.0, 3.0)

            .mapToInt(Double::intValue)

            .mapToObj(i -> "a" + i)

            .forEach(System.out::println);

    }

}
巴特西

Java8-Stream-No.08

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