设置可选项
baudrateComboBox.setItems(FXCollections.observableArrayList("1200","2400","4800","9600","14400","19200","38400","43000","57600","76800","115200","128000","230400","256000","460800","921600","1382400"));
设置选择项
baudrateComboBox.getSelectionModel().select(8);
添加值改变监听器
//设置连接选择框被选中 baudrateComboBox.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<String>() { @Override public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) { } });