File.listFiles(FileFilter) won't compile

Why won't the following compile?

Code :

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FileFilter ff = new FileNameExtensionFilter("...");
File[] files = new File("...").listFiles(ff);

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Says that there is no listFiles(FileFilter) method of File, but the documentation begs to differ. Using JDK 6 / Eclipse 7.

i am getting the same problem

That method wants a java.io.FileFilter while you're trying to give it a javax.swing.filechooser.FileFilter.