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Steps to Import JavaFX in a Java Program:

1. Download JavaFX
First, you need to download JavaFX from the official JavaFX website.
Once downloaded, extract the files. Inside, you will find a folder called lib which contains all the necessary JavaFX libraries.

2. Open IntelliJ IDEA and Create a New Project
Open IntelliJ IDEA, and create a New Project:
Go to File > New > Project.
Choose Java as the project type and make sure you have the correct JDK selected.

3. Add JavaFX Library to the Project
You need to tell IntelliJ where JavaFX is stored, so it can be used in your program:

Right-click on your project folder (in the left-side project explorer).
Select Open Module Settings (or press F4).
In the window that appears, click Libraries from the left-hand side menu.
Press the + button to add a new library.
Choose Java and find the folder where you downloaded and extracted JavaFX.
Inside the extracted folder, select the lib folder and click OK.
Now, JavaFX is available in your project.

4. Add VM Options for JavaFX
JavaFX requires some special instructions to run correctly. Here’s how you can set them up:

Go to the Run > Edit Configurations menu.
Find the VM options box and add the following line

--module-path <path-to-your-JavaFX-lib-folder> --add-modules=javafx.controls,javafx.fxml
Replace <path-to-your-JavaFX-lib-folder> with the location where you extracted JavaFX (the lib folder).


for example code : 

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        Button button = new Button("Click Me");
        button.setOnAction(e -> System.out.println("Hello, JavaFX!"));

        StackPane root = new StackPane();
        root.getChildren().add(button);

        Scene scene = new Scene(root, 300, 200);
        primaryStage.setTitle("JavaFX Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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