Adding files to a file[] statement in java

Question

Hello members of stackoverflow

I need some help with adding files from a directory to a bunch of files (File[])

So basically i want to add all the files in a directory to the following group of files:

File[] contents = {};

The user of my application will select a directory and i want that directories contents to be added to the above group of files ('contents I'm not sure how this is done because it doesn't have a simple 'add' method like an ArrayList/List does.

Any help with this would be greatly appreciated.

Thanks.

If you want to be able to easily add to a list after it's created, use a List, not an array. — Tim S.
– Tim S., Commented Oct 26, 2013 at 23:00

user2030471 · Accepted Answer · 2013-10-26 22:59:55Z

2

Use File.listFiles():

File dir = new File("/somedir");
File[] files = dir.listFiles();

answered Oct 26, 2013 at 22:59

user2030471

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2 Comments

user2826304 Over a year ago

Thanks for this, didn't realize it was such a simple solution. I was trying to use a for loop to add files but this is much better :)

user2030471 Over a year ago

Taking a look at the API documentation is always helpful.

Ankit Rustagi · Accepted Answer · 2013-10-26 23:13:54Z

1

    try
    {
        File folder = new File(FOLDER_NAME);
        File[] contents = folder.listFiles();
    }
    catch(Exception e) 
    {
        System.out.println("[Error] Folder not Found"); 
    }

edited Oct 26, 2013 at 23:13

answered Oct 26, 2013 at 23:00

Ankit Rustagi

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5 Comments

Ankit Rustagi Over a year ago

Could you elaborate ?

user2030471 Over a year ago

The File constructor throws only a NullPointerException when the argument is null. On the other hand listFiles throws a SecurityException. None of the exceptions say anything about the file/directory not being found.

user2030471 Over a year ago

The constructor is not validating the path. From doc - It "Creates a new File instance by converting the given pathname string into an abstract pathname." So even File f = new File(""); will execute without throwing any exception.

Ankit Rustagi Over a year ago

Nope, just checked again. It throws an exception if you have an incorrect path. Try it yourself once.

user2030471 Over a year ago

I doubt. Why do you think then File.exists() method is there for?

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