JavaFX Key combination color change

JavaFx Events and Event Handling: Exercise-4 with Solution

Write a JavaFX application that changes the background color of a window based on a combination of keys pressed (e.g., Ctrl+Alt+O changes the background to orange).

Sample Solution:

JavaFx Code:


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label; // Import Label
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;

public class Main extends Application {
    private StackPane root;

    public void start(Stage primaryStage) {
        primaryStage.setTitle("Key Combination Color Change");

        root = new StackPane();
        Scene scene = new Scene(root, 400, 300);

        // Initial background color
        root.setStyle("-fx-background-color: white;");

        // Label to display the message
        Label messageLabel = new Label("Press Ctrl+Alt+O to change the background to orange:");

        // Listen for key presses
        scene.addEventHandler(KeyEvent.KEY_PRESSED, event -> {
            if (event.isControlDown() && event.isAltDown() && event.getCode() == KeyCode.O) {
                // Ctrl+Alt+O changes background to orange
                root.setStyle("-fx-background-color: orange;");


    public static void main(String[] args) {

In the exercise above, we set up a JavaFX application that listens for key presses. When Ctrl+Alt+O is pressed, the background color changes to orange.

Note: You can add more key combinations and background colors as needed.

Sample Output:

JavaFx: JavaFX Key combination color change.
JavaFx: JavaFX Key combination color change.


Flowchart: JavaFX Key combination color change.

Java Code Editor:

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