AtomicProperties { public double getPolarizability(String symbol) { return htPolarizability.get(symbol); } private  AtomicProperties(); double getVdWVolume(String symbol); double getNormalizedVdWVolume(String symbol); double getElectronegativity(String symbol); double getNormalizedElectronegativity(String symbol); double getPolarizability(String symbol); double getNormalizedPolarizability(String symbol); double getMass(String symbol); double getNormalizedMass(String symbol); static AtomicProperties getInstance();  }
@Test public void testGetPolarizability() throws Exception { AtomicProperties props = AtomicProperties.getInstance(); double polar = props.getPolarizability("C"); Assert.assertTrue(polar > 0); }