列表增加列表增加

import java.util.Scanner;

public class jichu {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3};
        do {
            Scanner ms = new Scanner(System.in);
            int a = ms.nextInt();
            int[] arrn = new int[arr.length + 1];
            for (int i = 0; i < arr.length; i++) {
                arrn[i] = arr[i];
            }
            arrn[arrn.length-1] = a;
            arr = arrn;

            for (int i = 0; i < arr.length; i++) {
                System.out.print(arr[i]+" ");
            }
            System.out.println("是否就继续增加,y/n");
            char key = ms.next().charAt(0);
            if(key == 'n'){
                break;
            }
        }while (true);

    }
}