public class Main {

   public static void main(String[] args) {

        int[] ns = { 1, 4, 9, 16, 25 };

        // 倒序打印数组元素:

int[] n=new int[a.length];

        for (int i=ns.length-1;i>0;i--) {

a[a.length-i-1]=n[i];

        }

System.out.println(Arrays.toString(i));

    }

}