void testTop10() {
		System.err.println("most popular:");
		List<Song> top10 = topService.mostPopular(10);
		if(top10 == null) {
			System.err.println("no result!");
			return ;
		}
		
		int no = 0;
		for(Song s: top10) {
			System.err.print( ++no + "  " + s.getPlaycount() + "  ");
			System.err.println(s);
		}
		
		System.err.println("most recently:");
		top10 = topService.mostRecently(10);
		if(top10 == null) {
			System.err.println("no result!");
			return ;
		}
		
		no = 0;
		for(Song s: top10) {
			System.err.print( ++no + "  " + s.getUploadTime() + "  ");
			System.err.println(s);
		}			
	}