Help with reading arrays into a string

[dacuteangel04]

ok what my program is suppost to do is open a file - Grades.txt and read each line the breaking the lines down w/ tokens so i may later average some numbers

an example some of the lines from the text is:

234-42-1111 90 80 23 67
214-77-2222 12 45 80
112-45-7689 99 82 71 45

it has a id number on the left and grades on the right.

Im having trouble with reading the text into a string and exempting the lowest grades and then average them at the end

My codes so far is :


import java.util.StringTokenizer;
import java.io.*;


public class Exemption
{
public static void main (String [] args) throws IOException
{
// Strings
String studentNumber, studentgrade;

// access grades.txt

FileReader Grades = new FileReader("Grades.txt");
BufferedReader inputFile = new BufferedReader(Grades);

// reading lines
studentNumber = inputFile.readLine();
System.out.println("Reading file Grades.txt");
System.out.println("");
System.out.println("The grades for the class are listed below:");
System.out.println("");

// display and keep reading
while (studentNumber != null)
{
// display student number
System.out.println(studentNumber);
// read next student number
studentNumber = inputFile.readLine();
}


System.out.println("");
System.out.println("Next we will find out who is excempted from the final");

// tokens
String line, fileIn = "Grades.txt", fileOut = "Exempt.txt";
StringTokenizer tokens;
String name;

//input
FileReader fr = new FileReader(fileIn);
BufferedReader inFile= new BufferedReader(fr);

//output
FileWriter fw = new FileWriter (fileOut);
BufferedWriter bw = new BufferedWriter (fw);
PrintWriter outFile = new PrintWriter (bw);

line = inFile.readLine();
while (line != null)
{
tokens = new StringTokenizer(line);
name = null;

if (tokens.hasMoreTokens())
name = tokens.nextToken();


}
inputFile.close();


}




}


COULD SOMEBODY HELP ME PLEASE!!!

[blazedaces]

First of all, put your code in code tags please (when you post look to the right in the box that says "REPLAY GUIDELINES"). It's incredibly hard to read this way.

Are you reading from the file twice in the same method? Why?

I don't understand why you're just setting name to be every tokenizer one at a time.

Think about what you're trying to produce. Think about how you want to output it.

Edit: I think this is what you should be doing: tokenizing the string, making the first one equal to the student ID and taking the rest, one a time parsing them into an int and storing them. Then, after averaging them, keep the average. Sound about right?

Hope this helped

-blazed

[dacuteangel04]

import java.util.StringTokenizer;
import java.io.*;
 
 
public class Exemption
{
public static void main (String [] args) throws IOException
{
// Strings
String studentNumber, studentgrade;
 
// access grades.txt
 
FileReader Grades = new FileReader("Grades.txt");
BufferedReader inputFile = new BufferedReader(Grades);
 
// reading lines
studentNumber = inputFile.readLine();
System.out.println("Reading file Grades.txt");
System.out.println("");
System.out.println("The grades for the class are listed below:"); 
System.out.println("");
 
// display and keep reading
while (studentNumber != null)
{
// display student number
System.out.println(studentNumber);
// read next student number
studentNumber = inputFile.readLine();
}
 
 
System.out.println("");
System.out.println("Next we will find out who is excempted from the final");
 
// tokens
String line, fileIn = "Grades.txt", fileOut = "Exempt.txt";
StringTokenizer tokens;
String name;
 
//input
FileReader fr = new FileReader(fileIn);
BufferedReader inFile= new BufferedReader(fr);
 
//output
FileWriter fw = new FileWriter (fileOut);
BufferedWriter bw = new BufferedWriter (fw);
PrintWriter outFile = new PrintWriter (bw);
 
line = inFile.readLine();
while (line != null)
{
tokens = new StringTokenizer(line);
name = null;
 
if (tokens.hasMoreTokens())
name = tokens.nextToken();
 
 
}
inputFile.close();
 
 
}
 
 
 
 
}
 

[dacuteangel04]

import java.util.StringTokenizer;
import java.io.*;
 
 
public class Exemption
{
public static void main (String [] args) throws IOException
{
// Strings
String studentNumber, studentgrade;
 
// access grades.txt
 
FileReader Grades = new FileReader("Grades.txt");
BufferedReader inputFile = new BufferedReader(Grades);
 
// reading lines
studentNumber = inputFile.readLine();
System.out.println("Reading file Grades.txt");
System.out.println("");
System.out.println("The grades for the class are listed below:"); 
System.out.println("");
 
// display and keep reading
while (studentNumber != null)
{
// display student number
System.out.println(studentNumber);
// read next student number
studentNumber = inputFile.readLine();
}
 
 
System.out.println("");
System.out.println("Next we will find out who is excempted from the final");
 
// tokens
String line, fileIn = "Grades.txt", fileOut = "Exempt.txt";
StringTokenizer tokens;
String name;
 
//input
FileReader fr = new FileReader(fileIn);
BufferedReader inFile= new BufferedReader(fr);
 
//output
FileWriter fw = new FileWriter (fileOut);
BufferedWriter bw = new BufferedWriter (fw);
PrintWriter outFile = new PrintWriter (bw);
 
line = inFile.readLine();
while (line != null)
{
tokens = new StringTokenizer(line);
name = null;
 
if (tokens.hasMoreTokens())
name = tokens.nextToken();
 
 
}
inputFile.close();
 
 
}
 
 
 
 
}
 

My main problem is how to put the file into strings i guess to separate the id from the grades? Im very new with this so its kind of confusing!

[JosAH]

Read entire lines using a BufferedReader; split every line into individual
tokens using the String.split() method. Tokenizers are clumsy.

Alternatively use a Scanner to read ordinary int numbers.

kind regards,

Jos