Java - Run Method on Each File Using An Array of File Names

Question

Is it possible to run a method based on an array of filenames? For example, I wish to create an array of all files within a given directory - which this question discusses - but I then wish to apply a method to all files/filenames within the array.

The reason for this is because I have 300 (soon-to-be 500) image files which I wish to perform a function on, and it is clearly ridiculous to have to write 300-500 separate instances of the same function in the main() method for many obvious reasons (also, the number of images is likely to increase in the future, which would definitely make this approach even more ludicrous).

I would therefore like to know if this can be done using an array to store the file names, and then using the file name from each array location 0-299 in order to perform the function on said image file.

Something like this:

Create array of FileNames;

For
    all filenames 0-299 in array;
    perform method(filename(0-299));
End for

I have already written the relevant code to perform the function, I just need to know if there is a way of achieving my goal in a much more efficient manner.

A simpler way of putting this is to ask how to run a method on all files (not sub-directories) within a given directory?

Many thanks.

Lets see the relevant code that that you have written so far. I think that's the only way to really understand what you are saying. — Abbas
– Abbas, Commented Jan 30, 2012 at 13:27
docs.oracle.com/javase/tutorial/2d/images/loadimage.html ? with vashs answer from the link you posted. — L7ColWinters
– L7ColWinters, Commented Jan 30, 2012 at 13:31
I can in fact confirm that this is not homework and is, in fact, a private piece of work that I am working on for my own benefit. For those of you who have made that assumption, I can only inform you that you are incorrect. With regards to the code in question, that can be considered neither here nor there - my question is merely enquiring as to how to go about implementing something regardless of what code is going to be used, whether it is my own method, or a simple System.out.print("Text"); statement. — Mus
– Mus, Commented Jan 30, 2012 at 13:34

Vladimir Ivanov · Accepted Answer · 2012-01-30 16:56:07Z

4

public void processFiles() {
    File dir = new File("/tmp/");
       if (dir.isDirectory()) {
          final File[] files = dir.listFiles();
          for (File file : files) {
             myMethod(file);
          }
       }
}

private void myMethod(File file) {
   // do what you need here with the file
}

edited Jan 30, 2012 at 16:56

answered Jan 30, 2012 at 13:28

Vladimir Ivanov

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2 Comments

Artur Over a year ago

maybe someone has noticed missing opening brace ;-)

Artur Over a year ago

but still - that should not be a reason for down-voting since your answer is good

Oleg Mikheev · Accepted Answer · 2012-01-30 13:35:13Z

1

First of all using Java Collections is the preferred way to work with collections in Java.

Java Collections are easy to iterate - you can use the enhanced For-Each Loop for that: for(File f : collectionOfFiles) { ... }

Inside this enhanced for-each loop you will just need to call the method doing whatever you want it to do with your files.

answered Jan 30, 2012 at 13:35

Oleg Mikheev

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