获取2个不同列表的对象列表

list_a = [1, 2, 3]
list_b = [4, 5, 6]
merged_list = list_a + list_b
print(merged_list)

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

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

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

        List<Integer> mergedList = new ArrayList<>();
        mergedList.addAll(listA);
        mergedList.addAll(listB);

        System.out.println(mergedList);
    }
}

const listA = [1, 2, 3];
const listB = [4, 5, 6];
const mergedList = listA.concat(listB);
console.log(mergedList);