help me

Question

java FX

com/example/Controller.java

package com.example;

import com.example.model.Brand;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;

public class Controller {
    @FXML
    private VBox container;

    public void handlePlay(ActionEvent actionEvent) {
        System.out.println("[MUSIC PLAYING] - I shot the sheriff, but I didn't shoot the deputy");
    }

    public void switchBrand(Brand brand) {
      clearBrandStyles();
     container.getStyleClass().add(brand.toString().toLowerCase());  

    }

    public void clearBrandStyles() {
        for (Brand brand : Brand.values()) {

        }
    }

    public void handleBrandSwitch(ActionEvent actionEvent) {
        // Get a handle on the calling button
        Button btn = (Button) actionEvent.getSource();
        // Get access to the brand like Brand.APPLE by name
        Brand brand = Brand.valueOf(btn.getText().toUpperCase());
        switchBrand(brand);
    }
}

com/example/boombox.css

/* Brand settings */

.sony {
    -fx-background-color: black;
}

.jvc {
    -fx-background-color: red;
}

.apple {
    -fx-background-color: silver;
}

.coby {
    -fx-background-color: gray;
}

com/example/Main.java

package com.example;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("boombox.fxml"));
        primaryStage.setTitle("Boombox");
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

com/example/boombox.fxml

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Text?>
<VBox fx:controller="com.example.Controller"
      xmlns:fx="http://javafx.com/fxml"
      stylesheets="@boombox.css"
      fx:id="container">

    <HBox>
      <Button onAction="#handleBrandSwitch">Sony</Button>
      <Button onAction="#handleBrandSwitch">Apple</Button>
      <Button onAction="#handleBrandSwitch">JVC</Button>
      <Button onAction="#handleBrandSwitch">Coby</Button>
    </HBox>

    <Text text="Boombox" />
    <Button onAction="#handlePlay" text="Play"/>
</VBox>

com/example/model/Brand.java

package com.example.model;

public enum Brand {
    JVC("JVC"),
    SONY("Sony"),
    APPLE("Apple"),
    COBY("Coby");

    private String mDisplayName;

    Brand(String displayName) {
        mDisplayName = displayName;
    }

    public String getDisplayName() {
        return mDisplayName;
    }
}

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jinhwa yoo

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