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Thread: Operation on a txt file..

  1. #1
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    Question Operation on a txt file..

    1st is to obtain data from this text file n simply show in the console n then to show the information separated by commas under the columns of name: roll number: class: phone number: course:

    secondly it's to tell that how much characters, integers, blank spaces are in the .txt file...

    FILE DATA:

    andre neil, 211, IT, 04130001701, BSCS
    David miller, 219, CS, 0234000201, BSCS
    Johnson, 344, Maths, 0523400000478, BS(Maths)


    import java.util.*;
    import javax.swing.*;
    import java.io.*;
    public class TestStudent{
     
    public static void main(String args[]){
     
     
    	FileReader fr  = null;
     
    	BufferedReader br = null;
          String[] tokens=null;
     
    try{
     
     
    	fr = new FileReader("student.txt");
    	br = new BufferedReader(fr);
      	String line = br.readLine();
      	while (line !=null)
    	        {
     
     
    				 tokens= line.split(",");
      	          System.out.println(line);
      	           line = br.readLine();
     
    	         }
     
    	br.close();
    	fr.close();
     
    	}
              catch(IOException ioex){
    	      System.out.println(ioex);
     
    	}
     
     
     
    System.out.println("student no.1");
    Student s1 =new Student(tokens[0],tokens[1], tokens[2], tokens[3], tokens[4]);
    s1.print();
     
     
    }

    it's giving me just the last student's data

    student class is another file just to show the columns headings accordingly...


  2. #2
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    Default Re: Operation on a txt file..

    The problem is when you read the data into tokens[].
    while (line !=null)
    {
    	tokens= line.split(",");
    	System.out.println(line);
    	line = br.readLine();
    }

    'Tokens' can only contain data of just one student.
    So in the loop 'tokens' is overwritten with other data all the time.

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