//  Google "Java Reading from a File
//  There are various ways to set up the buffer
BufferedReader buf = new BufferedReader_To_Read_From_A_File;
 
//  Declare a HashMap (checkout HashMap in the Java Doc
//  online on the Sun website
HashMap storage = new HashMap();
while(buf.readLine() Still has Lines)
     String str = buf.readLine();
     //  Read word by word separated by " "
     StringTokenizer tokenizer(str, " ");
     //  Make up for all punctuations
     while(tokenizer.hasMoreTokens())
         String str2 = tokenizer.nextToken();
          if(str2 has ","){
               getRid of "," in str2
          }else if(str2 has "."){
               getRid of "." in str2
          }
          //...  etc
          // place str2 in storage and increase its
          // value
          int i = 0;
          Integer my_int = new Integer(1);
          if(storage_contains_str2){
             my_int = new Integer(storage.get(str2))
             i = my_int.intValue();
             i = i +1;
             my_int = new Integer(i);
           }
           storage.put(str2, my_int);
      }//  end while tokenizer
}//  finished readingLines
 

  
  StringTokenizer tokenizer = new StringTokenizer(fr.readLine(), " ");
  //  tokenizer is some sort of *iterator* - term loosely used for lack clarity
  //  Each token is a subset of the String fr.readLine() with " " as a delimeter
  //  e.g.  
  String str = "Today was a Good day";
  StringTokenizer tokenizer = new StringTokenizer(str, " ");
  String str1 = tokenizer.nextToken();
  String str2 = tokenizer.nextToken();
  String str3 = tokenizer.nextToken();
  ....  etc...
  
  //  str1 is "Today"
  //  str2 is "was"
  //  str3 is "a"
  ...  etc ...
  
  

  

HashMap storage = new HashMap();
public void incrementOccurences(String line){
     readThroughLineViaTheStringTokenizerMethodIexplained
     updateValueOfHashMap via storage.put...
     As explained in previous suggestion.
}