从 JavaFX 中的选择框中获取所选项目

ChoiceBox.getSelectionModel().selectedIndexProperty()

package delftstack;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.collections.*;
import javafx.beans.value.*;
import javafx.stage.Stage;
public class Choice_Box extends Application {


    public void start(Stage Choice_Box_Stage) {
        //title for the stage
    	Choice_Box_Stage.setTitle("ChoiceBox");

        //button to show
        Button Show_Button = new Button("Show Choice");

        // tile pane
        TilePane Title_Pane = new TilePane();

        // labels
        Label Label1 = new Label("This is a choice box, Please select your choice");
        Label Label2 = new Label("No Choice selected");

        // Choices array
        String Choice_Array[] = { "Delftstack 1", "Delftstack 2", "Delftstack 3", "Delftstack 4", "Delftstack 5" };

        // choiceBox
        ChoiceBox DemoChoiceBox = new ChoiceBox(FXCollections.observableArrayList(Choice_Array));

        // adding a listener
        DemoChoiceBox.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>() {

            // if items of the list are changed
            public void changed(ObservableValue ov, Number value, Number new_value) {

                // text for the label to the selected item
            	Label2.setText(Choice_Array[new_value.intValue()] + " is Selected");
            }
        });

        // ChoiceBox
        Title_Pane.getChildren().add(Label1);
        Title_Pane.getChildren().add(DemoChoiceBox);
        Title_Pane.getChildren().add(Label2);

        Scene sc = new Scene(Title_Pane, 400, 200);

        // Setting the scene
        Choice_Box_Stage.setScene(sc);

        Choice_Box_Stage.show();
    }

    public static void main(String args[]) {
        // launching the application
        launch(args);
    }
}