1 //1～10000000之间所有7的倍数和末尾含7的数一共有多少个呢 2 public class test { 3     public static void main(String[] args) { 4         int[] i={1,2,3,4,5,6,7,17}; 5         div(i,0,i.length-1); 6     } 7      8     private static void div(int[] i,int start,int end){ 9         if(start