Return Not-Hidden Files [duplicate]

Question

Prior to Java 8, this method would be used to create a list of hidden files:

    File[] hiddenFiles = new File("./directory/").listFiles(new FileFilter() {
        public boolean accept(File file) {
            return file.isHidden();
        }
    });

In Java 8, this can be shortened to:

File[] hiddenFiles = new File("./directory/").listFiles(File::isHidden);

Returning non-hidden files in the original code was a trivial change: return file.!isHidden(); as a substitute for return file.isHidden();. I cannot recreate this functionality within a single line.

There is no isNotHidden function within the File class. Without creating one (or without deferring to the original, more verbose code), is there a way to recreate it using the new single-line style?

Answer 1

How about this,

File[] hiddenFiles = new File("c:/data").listFiles(f -> !f.isHidden());

Answer 2

Coming in java-11 Predicate.not, until then you can't via a method reference

Predicate.not(File::isHidden)