package test1;public class test2 {?? ?public static void main(String args[])?? ?{?? ??? ?long x = 1;?? ???? long num = 999;?? ???? long count = 0;?? ???? for(int i=9;i>=1;i--)?? ???? {?? ??? ??? ?for (int j=1;j<=i;j++)?? ??? ??? ?{?? ??? ??? ??? ?x=x*10; //算法思路是用999除以x 如果商不等于0說明除數恰好小于被除數的位數一位，因此輸出i+1?? ??? ??? ?}?? ??? ??? ?count=num/x;?? ??? ??? ?if (count!=0)?? ??? ??? ?{?? ??? ??? ??? ?System.out.println(i+1);?? ??? ??? ??? ?break;?? ??? ??? ?}?? ??? ??? ???? }?? ?}}