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array problems!

6 replies on 1 page. Most recent reply: Aug 6, 2003 2:01 AM by Michael Ritchie

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Michael Ritchie

Posts: 3
Nickname: ritchie
Registered: Aug, 2003

array problems!

Posted: Aug 5, 2003 10:41 AM

Im trying to write part of a program where i have to read in data from a text file (all String) and then store it in an 'appropriate object'. I think the best way is to put it into an array but im not sure how to read straight from the file then store into the array can anyone help??

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: array problems!

Posted: Aug 5, 2003 10:54 AM

Here is a method which reads the contents of a text file into a String.

    public String readFile(File f){
        System.out.println("Reading file: " + f.getName());
        String text = "";
        try{
            String lineRead = "";
            BufferedReader br = new BufferedReader(new FileReader(f));
            while ((lineRead = br.readLine()) != null){
                text = text + lineRead + "\n";
            }
        }catch(FileNotFoundException fnfe){
            System.err.println("FileNotFoundException: " + fnfe.getMessage());
        }catch(IOException ioe){
            System.err.println("IOException: " + ioe.getMessage());			
        }
        return text;
    }

Michael Ritchie

Posts: 3
Nickname: ritchie
Registered: Aug, 2003

Re: array problems!

Posted: Aug 5, 2003 11:23 AM

OK thanks, but how do i put that into an array? im new to java as you can tell!

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: array problems!

Posted: Aug 5, 2003 12:08 PM

    public String[] readFile(File f){
        System.out.println("Reading file: " + f.getName());
        String text = "";
        String[] lines = null;
        try{
            String lineRead = "";
            int n = 0;
            BufferedReader br = new BufferedReader(new FileReader(f));
            while ((lineRead = br.readLine()) != null){
                text = text + lineRead + "\n";
                n++;
            } 
            lines = new String[n];
            int i = 0;
            StringReader sr = new StringReader(text);
            br = new BufferedReader(sr);
            while ((lineRead = br.readLine()) != null){
                lines[i] = lineRead;
                i++;
            }                       
        }catch(FileNotFoundException fnfe){
            System.err.println("FileNotFoundException: " + fnfe.getMessage());
        }catch(IOException ioe){
            System.err.println("IOException: " + ioe.getMessage());
        }
        return lines;
    }

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: array problems!

Posted: Aug 5, 2003 12:59 PM

Or use Jython:

linesArray = file( filename ).readlines()

;-0

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: array problems!

Posted: Aug 5, 2003 1:04 PM

By the way, in the Java, wouldn't it be simpler and clearer to read into an ArrayList then, if necessary, convert that to an array?

Michael Ritchie

Posts: 3
Nickname: ritchie
Registered: Aug, 2003

Re: array problems!

Posted: Aug 6, 2003 2:01 AM

OK thanks guys that helped a lot!

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