Looping tokenizer and notepad display

Our assignment is to retrieve a file and categorize it and display it in another file. Last name first name, then grade.

I am having trouble with getting a loop going because of the error

"java.util.NoSuchElementException"

This only happens when I change the currently existing while I loop I have. I also have a problem of displaying the result. The result I display is all in one line, which I can't let happen. Here is my code so far:

import java.util.*;
import java.util.StringTokenizer;
import java.io.*;
import javax.swing.*;
import java.text.DecimalFormat;


class Grade
{
    public static void main(String [] args)throws IOException

    {
        //declaring     
        String line = "";
        StringTokenizer st;
        String delim = " \t\n\r,-";
        String token;
        String firstname;   
        String lastname;
        String grade;
        String S69andbelow="Students with 69 or below\n";
        String S70to79 ="Students with 70 to 79\n";
        String S80to89= "Students with 80 to 89\n";
        String S90to100= "Students with 90 to 100\n";
        int gradeint;
        double gradeavg = 0;
        int count = 0; 
        File inputFile = new File("input.txt");
      File outputFile = new File("output.txt");
        FileInputStream finput = new FileInputStream(inputFile);
      FileOutputStream foutput = new FileOutputStream(outputFile);

      FileReader reader = new FileReader(inputFile);
      BufferedReader in = new BufferedReader(reader);

        Scanner std = new Scanner(new File("input.txt"));

        Scanner scanner = new Scanner(inputFile);

        BufferedWriter out = new BufferedWriter(new FileWriter(outputFile));

        Scanner scan = new Scanner(S69andbelow);        
        //reading linev
        line = scanner.nextLine();

        st = new StringTokenizer(line, delim);
        //avoiding selected characters
        try
        {
            while(st.hasMoreTokens())
        {



                firstname = st.nextToken(); //<----error started to happen 
                lastname = st.nextToken(); //here
                grade = st.nextToken(); //and here
                //storing tokens into their properties

                gradeint = Integer.parseInt(grade);
                //converting token to int

                gradeavg = gradeavg + gradeint;
                //calculating avg

                count++;
                //recording number of entries

            if (gradeint <=69)
            {
                S69andbelow = S69andbelow + lastname + " " 
                        + firstname + " " + "\t" + grade + "\n";
            }   // saving data by grades    

            else if (gradeint >= 70 && gradeint <= 79)
            {
                S70to79 = S70to79 + lastname + " " + firstname 
                        + " " + "\t" + grade + "\n";
            }   // saving data by grades

            else if (gradeint >= 80 && gradeint <=89)
            {
                S80to89 = S80to89 + lastname + " " + firstname 
                        + " " + "\t" + grade + "\n";
            }   // saving data by grades

            else 
            {
                S90to100 = S90to100 + lastname + " " + firstname
                         + " " + "\t" + grade + "\n";
            }   // saving data by grades


}//end while

            System.out.println(S69andbelow + "\n" + S70to79 + "\n" 
                         + S80to89 + "\n" + S90to100);
                //caterorizing the grades

                gradeavg = gradeavg / count;
                //calculating average

              开发者_运维问答  DecimalFormat df = new DecimalFormat("#0.00");

                out.write("The average grade is: " 
                        + df.format(gradeavg));


            System.out.println("The average grade is: " 
                        + df.format(gradeavg));



            Writer output = null;            

            output = new BufferedWriter(new FileWriter(outputFile));

            //  scanner.nextLine(S69andbelow);
            //output.write(S69andbelow + "\n" + S70to79 + "\n" 
        //               + S80to89 + "\n" + S90to100);
        //  output.close();


}
        catch( Exception e )
        {  
                System.out.println(e.toString() );
         }
        // Close the stream
        try
        {
            if(std != null )
               std.close( );


                                }
        catch( Exception e )
        {
             System.out.println(e.toString());
         }

}
}

Question has been answered. The final touches is as presented: /******************* Program Name: Grade Name: Dennis Liang Due Date: 3/31/11 Program Description: Write a program which reads from a file a list of students with their Grade. Also display last name, first name, then grade. ********************/

import java.util.; import java.util.StringTokenizer; import java.io.; import javax.swing.*; import java.text.DecimalFormat;

class Grade { public static void main(String [] args)throws IOException

{
    //declaring     
    String delim = " \t\n\r,-";
    String token;
    String firstName;   
    String lastName;
    String grade;
    String S69andbelow="Students with 69 or below\n";
    String S70to79 ="Students with 70 to 79\n";
    String S80to89= "Students with 80 to 89\n";
    String S90to100= "Students with 90 to 100\n";
    String all;
    int gradeint;
    double gradeavg = 0;
    int count = 0;
    int countTwo = 0; 
    File inputFile = new File("input.txt");
  File outputFile = new File("output.txt");
    FileInputStream finput = new FileInputStream(inputFile);
  FileOutputStream foutput = new FileOutputStream(outputFile);

  FileReader reader = new FileReader(inputFile);
  BufferedReader in = new BufferedReader(reader);

    Scanner std = new Scanner(new File("input.txt"));

    Scanner scanner = new Scanner(inputFile);

    BufferedWriter out = new BufferedWriter(new FileWriter(outputFile));

    Scanner scan = new Scanner(S69andbelow);        

    try
    {
    String line, newLine = (String)System.getProperty("line.separator");
        //seperating lines
    while((line = in.readLine()) != null){
        //Will only work if the file is properly formatted
    StringTokenizer st = new StringTokenizer(line, " ");

    if (st.countTokens() == 3)
        {
        firstName = st.nextToken();     
        lastName = st.nextToken();
        grade = st.nextToken();
        gradeint = Integer.parseInt(grade);
        //retrieving tokens
        gradeavg = gradeavg + gradeint;
        //formula for avg
        count++;
        //avg count

        //organizing by grades
      if (gradeint <=69)
    {
        S69andbelow = S69andbelow + newLine+ lastName + " " 
                + firstName + " " + "\t" + grade + newLine;
    }   
         else if (gradeint >= 70 && gradeint <= 79)
    {
        S70to79 = S70to79 +newLine+  lastName + " " + firstName 
                + " " + "\t" + grade + newLine;
    }   

        else if (gradeint >= 80 && gradeint <=89)
    {
        S80to89 = S80to89 + newLine+ lastName + " " + firstName 
                + " " + "\t" + grade + newLine;
    }   

         else 
    {
        S90to100 = S90to100 + newLine+ lastName + " " + firstName
                 + " " + "\t" + grade + newLine;
    }

} else{ countTwo ++; System.out.println("There is "+ countTwo + " person/people" + " that require additional information" + "\n"); } //informing the user that there a how many people with } //missing information or too much.

            System.out.println(S69andbelow + "\n" + S70to79 + "\n" 
                     + S80to89 + "\n" + S90to100);
            //caterorizing the grades

            gradeavg = gradeavg / count;
            //calculating average

            DecimalFormat df = new DecimalFormat("#0.00");
            //formating



            System.out.println("The average grade is: " 
                    + df.format(gradeavg));
            //displaying


            Writer output = null;            

            output = new BufferedWriter(new FileWriter(outputFile));
            //make file
            output.write(newLine + S69andbelow + newLine + S70to79 + newLine 
                 + S80to89 + newLine + S90to100);
            output.write("The average grade is: " 
                    + df.format(gradeavg));      
            //outputing to file      
            output.close();
            //saving

} catch( Exception e ) {

System.out.println(e.toString() ); } // Close the stream try { if(std != null ) std.close( );

                            }
     catch( Exception e )
    {
         System.out.println(e.toString());
     }

} }

You need to check st.hasMoreTokens() before each time you call st.nextToken()

As far as the new line, windows requires \n\0

Alternatively, you can use System.getProperty("line.separator") which gives you the correct newline for each OS.

String line, newLine = (String)System.getProperty("line.separator");
while((line = in.readLine()) != null){
//Will only work if the file is properly formatted
StringTokenizer st = new StringTokenizer(line, " ");
firstName = st.nextToken();
lastName = st.nextToken();
grade = st.nextToken();
gradeint = Integer.parseInt(grade);

gradeavg = gradeavg + gradeint;

count++;

                    if (gradeint <=69)
        {
            S69andbelow = S69andbelow + lastname + " " 
                    + firstname + " " + "\t" + grade + newLine;
        }   
        else if (gradeint >= 70 && gradeint <= 79)
        {
            S70to79 = S70to79 + lastname + " " + firstname 
                    + " " + "\t" + grade + "\n";
        }   

        else if (gradeint >= 80 && gradeint <=89)
        {
            S80to89 = S80to89 + lastname + " " + firstname 
                    + " " + "\t" + grade + newLine;
        }   

        else 
        {
            S90to100 = S90to100 + lastname + " " + firstname
                     + " " + "\t" + grade + newLine;
        }


}