public void save( String fn ) 
	{ 
		try( ObjectOutputStream os = new
				ObjectOutputStream( new FileOutputStream( fn ) ) ) 
				{ 
			os.writeInt( size ); 
			for( T x : this ) os.writeObject( x ); 
				} 
		catch( IOException e ) 
		{ 
			e.printStackTrace( ); 
		} 
		System.out.println( "Save done" ); 
	}