java数组扩容问题

Question

{
        int arr1[]={5,6,7,56,12,36,78};
        Scanner myscanner=new Scanner(System.in);
        do {
            int a[]=new int[arr1.length+1];
            int x=myscanner.nextInt();
            for(int i=0;i<a.length;i++)
            {
                a[i]=arr1[i];}
            a[a.length-1]=x;
            arr1=a;
            for(int j=0;j<arr1.length;j++)
            {
                System.out.print(a[j]+" ");
            }


            char key=myscanner.next().charAt(0);
            if(key=='n')
            {
                break;}


        }while(true);



        }
> 我希望这个数组的空间扩大一个，如果不输入你，就一直扩容。为什么得不到理想结果，也没有报错

Answer 1

基于Monster 组和GPT的调写：
更新后的代码：

int[] arr1 = {5, 6, 7, 56, 12, 36, 78};
Scanner myscanner = new Scanner(System.in);
do {
    int x = 0;
    try {
        System.out.println("请输入一个数字：");
        x = myscanner.nextInt();
    } catch (InputMismatchException e) {
        System.out.println("输入不是数字，请重新输入。");
        myscanner.next(); // 清除输入缓存区
        continue;
    }
    int[] a = new int[arr1.length + 1];
    for (int i = 0; i < arr1.length; i++) {
        a[i] = arr1[i];
    }
    a[arr1.length] = x;
    arr1 = a;
    for (int j = 0; j < arr1.length; j++) {
        System.out.print(arr1[j] + " ");
    }
    System.out.println("是否继续添加元素？（y/n）");
    char key = myscanner.next().charAt(0);
    if (key == 'n') {
        break;
    }
} while (true);