如何将不同表项的数组合并在一起？

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

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

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

public class Main {
    public static void main(String[] args) {
        List<Integer> list1 = new ArrayList<>();
        list1.add(1);
        list1.add(2);
        list1.add(3);

        List<Integer> list2 = new ArrayList<>();
        list2.add(4);
        list2.add(5);
        list2.add(6);

        List<Integer> mergedList = new ArrayList<>();
        mergedList.addAll(list1);
        mergedList.addAll(list2);

        System.out.println(mergedList); // 输出 [1, 2, 3, 4, 5, 6]
    }
}