Java 7 "Diamond in Generic"

[meeta gaur]

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.DirectoryStream;
import java.util.Iterator;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.DirectoryIteratorException;

class FileFilter{

	public static void main(String[] args){
		Path path=Paths.get("c:\\");
		DirectoryStream.Filter<Path> fileFilter=new DirectoryStream.Filter<>(){
			public boolean accept(Path path){
				return Files.isRegularFile(path);
			}
		};

		try(DirectoryStream<Path> ds=Files.newDirectoryStream(path,fileFilter)){
			Iterator<Path> iterator=ds.iterator();
			while(iterator.hasNext()){
				System.out.println(iterator.next());
			}
		}
		catch(IOException | DirectoryIteratorException exception){
			System.err.println(exception);
		}
	}
}

FileFilter.java:13: error: cannot infer type arguments for Filter<T>;
DirectoryStream.Filter<Path> fileFilter=new DirectoryStream.Filter<>(){
^

1 error

Normally it works like List<String> list=new ArrayList<>();

But why it isn't working above ?

[meeta gaur]

It seems Diamond doesn't work with inner class.

[Tony Docherty]

It seems Diamond doesn't work with inner class.

It does work with inner classes but not with anonymous inner classes.

According to the JLS section 15.9:
"It is a compile-time error if a class instance creation expression declares an anonymous class using the "<>" form for the class's type arguments."

[meeta gaur]

Thank you.