创建一个类,写一个静态方法,传入一个int数组,得 到一个字符串[元素1,元素2,….]

class Work{
public static String toString(int[]  arr) {
        //非空校验
        if (arr == null) {
            return null;
        }

        String str = "[";
        for (int i = 0; i < arr.length; i++) {
            str += arr[i];
            if (i == arr.length - 1) {
                break;
            }
            str += ",";
        }
        str += "]";
        return str;

    }

public static void main(String[] args) {

    int[] arr = new int[]{1, 55, 66, 99, 88, 74, 22, 44, 32, 22};
    String s = toString22(arr);
    System.out.println(s);

}
}