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  1. #1
    sehudson's Avatar
    sehudson is offline Senior Member
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    Default Input Stream as an Object?

    I am reading in a file using:

    Java Code:
      JFileChooser fileopen = new JFileChooser();
            String Title = "Please select your matrix file";
            fileopen.setDialogTitle(Title);
            int ret = fileopen.showDialog(null, "Open file");
    
            if (ret == JFileChooser.APPROVE_OPTION) {
                file = fileopen.getSelectedFile();
            }
            try {
                FileInputStream fstream = new FileInputStream(file);
                // Get the object of DataInputStream
                DataInputStream in = new DataInputStream(fstream);
                BufferedReader br = new BufferedReader(new InputStreamReader(in));
                String str;
    //Iterate over each line in the file and get a count on the number of Rows. This will help determine the
    //size of the LinkedListArray.
                while ((str = in.readLine()) != null) {
                    Lines++;
                }
                in.close();
    //We have to account for the matrix dimensions row, so remove a row.
                RowCount = Lines - 1;
            } catch (Exception e) {
                System.out.println(e.toString());
                System.exit(1);
        }
    This is to get the number of rows in the file so I can initialize a LinkedListArray to its proper size. Later in my program, I create a new file input stream and read in lines from the same file again to actually do the processing. Is there a way that I can gather thee data from the file during the first process, and store it, so that the 2nd time I dont have to read the file again.

  2. #2
    Eranga's Avatar
    Eranga is offline Moderator
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