import java.io.*;public class  Ks1{ public static void main(String args[]) throws IOException     {   FileWriter fw=new FileWriter("d:\\a.txt");         int i,j,a,k=1,s=0,wdy;         int ss[]=new int[500];         for(i=1;i<=200;i++)          {     a=(int)(Math.random()*1000+1);              for(j=2;j<a;j++)               {       if(a%j==0)                   break;               }                   if(j==a)                    {                        s=s+a;                       ss[k]=a;                       k++;                     }           }     for(i=1;i<k-1;i++)      for(j=1;j<k-1;j++)        if(ss[j]>=ss[j+1])         {    wdy=ss[j];             ss[j]=ss[j+1];             ss[j+1]=wdy;       }            for(i=1;i<k;i++)             {           fw.write(Integer.toString (ss[i]));                fw.write(",");}                fw.write("个数为"+Integer.toString( k-1)+""+"个,");                fw.write( "素数平均书为"+Integer.toString(s/(k-1))+" 。");                fw.close();             }  }

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