Java: Using multiple DataInputStreams on single FileInputStream

Question

Suppose I have the following code in Java:

        FileInputStream fin = new FileInputStream(filename);
        DataInputStream x = new DataInputStream(fin);
        DataInputStream y = new DataInputStream(fin);
        DataInputStream z = new DataInputStream(fin);

I want to use y.skip(100) and z.skip(200) to simultaneously read data from the file at different positions. Will this work? I'm getting EOF errors at the moment...

EDIT

I did try the following code:

        FileInputStream fin1 = new FileInputStream(filename);
        FileInputStream fin2 = new FileInputStream(filename);
        FileInputStream fin3 = new FileInputStream(filename);
        DataInputStream x = new DataInputStream(fin1);
        DataInputStream y = new DataInputStream(fin2);
        DataInputStream z = new DataInputStream(fin3);

This does not produce EOF errors, but still not sure if this might return corrupted data?...

score 1 · Accepted Answer · 2015-08-14 13:30:57Z

1

I seem to have found a solution. The original doesn't work because it just increments the file pointer every time, regardless of the DataInputStream used. Instead I needed to create additional FileInputStreams's. Works fine.

edited Aug 14, 2015 at 13:30

answered Aug 14, 2015 at 13:17

user1300214

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Comments

user207421 · Accepted Answer · 2015-08-15 10:19:26Z

0

In this specific case it won't produce corrupted data, but if there had been a BufferedInputStream anywhere in association with them it would have.

The real question is why on earth you would want to do this? Why can't you use the same DataInputStream?

answered Aug 15, 2015 at 10:19

user207421

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1 Comment

user1300214 Over a year ago

I have a legacy data file containing 3d vector field data. All x values are stored first then all the y values and then all the z values, ie the data doesn't read as (x,y,z) each time. I could loop trhough the data 3 separate times, but this is onefficient on large data sets. Maybe theres another way to achieve what i want? I have no control over the data file.

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