我应该如何把这些列表放在一起？

list1 = [1, 2, 3]
list2 = [4, 5, 6]
merged_list = list1 + list2
print(merged_list)  # 输出: [1, 2, 3, 4, 5, 6]

let array1 = [1, 2, 3];
let array2 = [4, 5, 6];
let mergedArray = array1.concat(array2);
console.log(mergedArray);  // 输出: [1, 2, 3, 4, 5, 6]

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

public class Main {
    public static void main(String[] args) {
        List<Integer> list1 = new ArrayList<>(Arrays.asList(1, 2, 3));
        List<Integer> list2 = new ArrayList<>(Arrays.asList(4, 5, 6));
        List<Integer> mergedList = new ArrayList<>(list1);
        mergedList.addAll(list2);
        System.out.println(mergedList);  // 输出: [1, 2, 3, 4, 5, 6]
    }
}

using System;
using System.Collections.Generic;

class Program {
    static void Main() {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<int> list2 = new List<int> { 4, 5, 6 };
        List<int> mergedList = new List<int>(list1);
        mergedList.AddRange(list2);
        Console.WriteLine(string.Join(", ", mergedList));  // 输出: 1, 2, 3, 4, 5, 6
    }
}