从阵列数组转换为单个数组

const arrays = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
const singleArray = arrays.flat();
console.log(singleArray); // [1, 2, 3, 4, 5, 6, 7, 8, 9]

arrays = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
single_array = [item for sublist in arrays for item in sublist]
print(single_array)  # [1, 2, 3, 4, 5, 6, 7, 8, 9]

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

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

        List<Integer> singleArray = new ArrayList<>();
        for (List<Integer> sublist : arrays) {
            singleArray.addAll(sublist);
        }

        System.out.println(singleArray); // [1, 2, 3, 4, 5, 6, 7, 8, 9]
    }
}

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<List<int>> arrays = new List<List<int>>
        {
            new List<int> {1, 2, 3},
            new List<int> {4, 5, 6},
            new List<int> {7, 8, 9}
        };

        List<int> singleArray = new List<int>();
        foreach (List<int> sublist in arrays)
        {
            singleArray.AddRange(sublist);
        }

        Console.WriteLine(string.Join(", ", singleArray)); // 1, 2, 3, 4, 5, 6, 7, 8, 9
    }
}