[java] How to delete directory content in Java?

After enumerating a directory, I now need to delete all the files.

I used:

final File[] files = outputFolder.listFiles();
files.delete();

But this hasn't deleted the directory.

Here is one possible solution to solve the problem without a library :

public static boolean delete(File file) {

    File[] flist = null;

    if(file == null){
        return false;
    }

    if (file.isFile()) {
        return file.delete();
    }

    if (!file.isDirectory()) {
        return false;
    }

    flist = file.listFiles();
    if (flist != null && flist.length > 0) {
        for (File f : flist) {
            if (!delete(f)) {
                return false;
            }
        }
    }

    return file.delete();
}

You have to do this for each File:

public static void deleteFolder(File folder) {
    File[] files = folder.listFiles();
    if(files!=null) { //some JVMs return null for empty dirs
        for(File f: files) {
            if(f.isDirectory()) {
                deleteFolder(f);
            } else {
                f.delete();
            }
        }
    }
    folder.delete();
}

Then call

deleteFolder(outputFolder);

Use FileUtils with FileUtils.deleteDirectory();

To delete folder having files, no need of loops or recursive search. You can directly use:

FileUtils.deleteDirectory(<File object of directory>);

This function will directory delete the folder and all files in it.

All files must be delete from the directory before it is deleted.

There are third party libraries that have a lot of common utilities, including ones that does that for you:

• Apache commons-lang FileUtils.forceDelete(..)
• guava Files.deleteRecursively(..)

for(File f : files) {
    f.delete();
}    
files.delete(); // will work

You can't delete on an array ! This should work better :

for (File f : files) f.delete();

But it won't work if the folders are not empty. For this cases, you will need to recursively descend into the folder hierarchy and delete everything. Yes it's a shame Java can't do that by default...

You can't delete an File array. As all of the other answers suggest, you must delete each individual file before deleting the folder...

final File[] files = outputFolder.listFiles();
for (File f: files) f.delete();
outputFolder.delete();