How to use BufferedReader in Java

Question

Sorry if this is an obvious question  but I can t seem to get it  I m working on an assignment for a Data Structures course  It involves pulling data from a simple  dat file  We had never used any of the file-accessing options in Java before  so the professor just gave us the working code for that piece   A class called FileReadExample creates a new BufferedReader object  opens a file  and then is supposed to kick out a bunch of data about that file  But I cannot access any of the data at all   In a separate testMain file  I created a new FileReadExample object named fr and then attempted to print out things like fr readLine   from there  but it tells me there is no such method   I m sure I m missing something staggeringly easy   The professor s code   import java io BufferedReader  import java io File  import java io FileReader  import java io IOException   public class FileReadExample       public static void main String   args                System out println  got here            try                       BufferedReader in   new BufferedReader new FileReader new File  sample-file dat                  System out println  File open successful                  int line   0              for  String x   in readLine    x    null  x   in readLine                                  line                    System out println x                   if  line  lt   3                                        String   tokens   x split                           System out println  Number of tokens in line     line          tokens length                       System out println  The tokens are                         for  String token   tokens                                                System out println token                                                           else                                       String   tokens   x split                             System out println  Number of tokens in line     line          tokens length                       System out println  The tokens are                         for  String token   tokens                                                System out println token                                             Integer   values   new Integer tokens length                       Integer sum   0                      for  int i   0  i  lt  tokens length  i                                                  sum    Integer parseInt tokens i                                              System out println  Sum      sum                                             catch  IOException e                        System out println  File I O error                         Thanks

User · Answer

As far as i understand fr is the object of your FileReadExample class. So it is obvious it will not have any method like fr.readLine() if you dont create one yourself.

secondly, i think a correct constructor of the BufferedReader class will help you do your task.

String str;
BufferedReader buffread = new BufferedReader(new FileReader(new File("file.dat")));
str = buffread.readLine();
.
.
buffread.close();

this should help you.

User · Answer

Try this to read a file   BufferedReader reader   null   try       File file   new File  sample-file dat        reader   new BufferedReader new FileReader file         String line      while   line   reader readLine       null            System out println line            catch  IOException e        e printStackTrace      finally       try           reader close          catch  IOException e            e printStackTrace

[java] How to use BufferedReader in Java

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