Java - contar el número de ocurrencias de una palabra en un texto

public class TestWords extends Application {

	@Override

	public void start(Stage stg) throws Exception {

		TextArea text = new TextArea();

		Scene sc = new Scene(text, 800, 600);

		ScheduledService<Integer> backg = new ScheduledService<Integer>() {

			@Override

			protected Task<Integer> createTask() {

				return new Task<Integer>() {

					Pattern pt = Pattern.compile("(?i)\\b(hijo)\\b");

					@Override

					protected Integer call() throws Exception {

						Matcher m = pt.matcher(text.getText());

						int count = 0;

						while(m.find()) {

							count++;

						}

						return count;

					}

				};

			}

		};

		backg.setOnSucceeded((value) -> {

			System.out.printf("Encontrado 'hijo' %d veces.\n", backg.valueProperty().get());

		});

		stg.setScene(sc);

		stg.show();

		backg.setPeriod(Duration.seconds(5));

		backg.start();

	}

	/* */

	public static void main(String args[]) {

		launch(args);

	}

}