class MySJFO extends SimpleJavaFileObject {
        public MySJFO( String name ) { super( name ); }
        public MySJFO( String name, JavaFileObject.Kind kind ) { super( name, kind ); }
        public CharSequence getCharContent(boolean ignoreEncodingErrors)
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            return null;
        }
        public InputStream openInputStream()
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            return null;
        }
        public OutputStream openOutputStream()
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            throw new UnsupportedOperationException();
        }
    }

    new MySJFO( "name.html" ).getKind() returns JavaFileObject.Kind.OTHER
import java.io.*;
import javax.tools.*;


public class SJFOgetKind {

    static class MySJFO extends SimpleJavaFileObject {
        public MySJFO( String name ) { super( name ); }
        public MySJFO( String name, JavaFileObject.Kind kind ) { super( name, kind ); }
        public CharSequence getCharContent(boolean ignoreEncodingErrors)
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            return null;
        }
        public InputStream openInputStream()
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            return null;
        }
        public OutputStream openOutputStream()
                                throws IOException, IllegalStateException, UnsupportedOperationException {
            throw new UnsupportedOperationException();
        }
    }

    public static void main( String[] args ){
        System.out.println( new MySJFO( "name.html" ).getKind() );
    }

}