write a program to enter a string and find the existence of a character(y/n), occurence of a perticular character with position

class CheckString

 {

  public static void main(String args[])

   {

     String str="kapil";

     int len=str.length();

     char[] a=new char[len];

      for(int i=0;i<len;i++)

       {

         a[i]=str.charAt(i);

         if(a[i]=='a')

          {

           System.out.println("yes charector is exist at the posotion"+i+"  charector="+a[i]);

         }

         else

         {

           System.out.println("not fond charec.");

         }

       }

    }

 }