从两个数组中创建数组

const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const newArray = array1.concat(array2);
console.log(newArray); // [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) {
        Integer[] array1 = {1, 2, 3};
        Integer[] array2 = {4, 5, 6};
        
        List<Integer> list1 = new ArrayList<>(Arrays.asList(array1));
        List<Integer> list2 = new ArrayList<>(Arrays.asList(array2));
        
        list1.addAll(list2);
        
        Integer[] newArray = list1.toArray(new Integer[0]);
        System.out.println(Arrays.toString(newArray)); // [1, 2, 3, 4, 5, 6]
    }
}