对默认值组合框JavaFX的触发操作

Question

我试图在初始化组合框的默认值时触发一个动作，但我只能找到在使用ComboBox的OnAction中设置的方法print（）更改值时触发动作的方法。

这是我的FXML文件的主持人：

package tre;

import java.net.URL;
import java.util.ResourceBundle;

import javax.swing.event.ChangeListener;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;

public class presenter implements Initializable {

    public @FXML ComboBox<String> combo;
    private final ObservableList<String> statistic = FXCollections.observableArrayList("Logged In", "Anonymous",
            "Logged Off");

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        // TODO Auto-generated method stub

        combo.setItems(statistic);
        combo.setValue("Anonymous");

        //TODO When Anonymous is displayed as default value in the combo box, it will print it.

    }

    public @FXML void print(){          
        String sel = combo.getSelectionModel().getSelectedItem();
        System.out.println(sel);

    }

}

有解决方案吗？感谢