Frequency Count Of Words in a Given Text

import java.io.*;
import java.util.*;
class Fre_count  
{
 public static void main(String[] args) throws IOException
 {
  BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
  System.out.println("enter a string");
  String a=new String(b.readLine());
  System.out.println("enter the word you want to find the count");
  String c=new String(b.readLine());
  StringTokenizer s=new StringTokenizer(a);
  int i=s.countTokens();
  int k=0,j=0;
  String tok[]=new String[i];
  while(s.hasMoreTokens())
  {
   tok[j++]=s.nextToken();
  }

  for(j=0;j<tok.length;j++)
  {
   if(c.equals(tok[j]))
    k++;
  }
  System.out.println("frequency count of "+c+" is "+k);
 }
}