[ale] OT: java filereader question

[J.M. Taylor]

Sun's 1.4.1_02, and your suggestion is *exactly* what I'm trying.  I even 
backed off and just tried to do
FileReader fr = new FileReader("file1");
 
and then I took out *all* of my code except where I instantiate the 
FileReader inside the method...still I'm getting:
unreported exception java.io.FileNotFoundException; must be caught or 
declared to be thrown
      FileReader fr = new FileReader("file1");
                      ^

This is the skeleton of the code I'm using...FileReader works fine inside 
of main...there is definitely something major I'm missing here...
-----
import java.util.*;
import java.io.*;

public class mergesort
{
  public static void main(String[] args) throws java.io.IOException
  {
    /*--snip---*/
    doMergeSort(1,0,100);
  }

  public static void doMergeSort(int blsize, int fileset, double filesize)
  {
    if (blocksize < filesize/4)
    {
      FileReader fr = new FileReader("file1");  
    }
  }
}

Thanks very much for looking at this...I'm afraid Java is still more than 
a little bit of black magic to me right now.

jenn



On Thu, 8 Apr 2004, Denny Chambers wrote:

> First, what version of java are you using? (java -version)
> 
> If you using Sun/IBM/Blackdown versions 1.1 or later, then this should work:
> 
> String filename = (conditional ? "file1" : "file2");
> FileReader fr = new FileReader(filename);
> 
> Now file1 and file2 should be a string representation of the relative or absolute path the files in question
> 
> FileReader has a constructor FileReader(String fileName)
> 
> 
> Denny
> 
> 
> 
> J.M. Taylor wrote:
> 
> >Greetings all,
> >
> >I need to evaluate a condition and decide whether to open file1 or file2 
> >based on that condition.  Obviously I can do
> >if (conditional) {
> >  FileReader fr = new FileReader("file1");
> >}
> >else {
> >  FileReader fr = new FileReader("file2");
> >}
> >
> >However, with my undisciplined scripting language background I would like 
> >to do something like
> >
> >File filename = (conditional ? "file1" : "file2");
> >FileReader fr = new FileReader(filename);
> >
> >I can do the ternary operator if I declare filename as a String, but then 
> >FileReader won't open it (the parameter must be a File object). 
> >  new FileReader((File)filename) 
> >doesn't work either.
> >
> >Nor does 
> >FileReader fr = (conditional ? new FileReader("file1") : new 
> >FileReader("file2"));
> >
> >Nor does 
> >FileReader fr = new FileReader((conditional ? "file1" : "file2")); 
> >
> >I don't use Java very much, but I like to understand what's going on (and 
> >why I can and can't do things from language to language) as much as 
> >possible.  If anybody out there in aleland uses Java and can help me out, 
> >I would greatly appreciate it.  I won't be offended if you tell me why I'm 
> >being brain-dead, if that is in fact the case.
> >
> >Thanks
> >jenn
> >
> >  
> >
> 

-- 
Jenn Taylor
jtaylor at onlinea.com

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