小编bis*_*rot的帖子

我正在做一些Java 8流的"代数",也就是说,我正在尝试编写一个简单的操作Op,它将两个流作为输入并产生另一个流.

所以我有这个简单的代码,其目的是在一系列数字中打印secund最高值:

import java.util.Arrays;
import java.util.stream.IntStream;

public class SecundHighestValue {

    public static void main(String[] args) {

        //setting the input parameters
        int [] numbers = {1, 2, 3, 4, 3, 4, 2, 1};

        IntStream S1 = Arrays.stream(numbers);
        IntStream S2 = Arrays.stream(new int[] {Arrays.stream(numbers).max().getAsInt()} );

        // setting the operation
        IntStream S3 = S1.filter(x-> x != S2.toArray()[0]); // doesn't work

        /*** does work  ***
        int  maxNumber = S2.toArray()[0];
        IntStream S3 = S1.filter(x-> x != maxNumber);
        */

        // accessing the operation's result stream …