JavaFX: Add style to a button using style sheet

You can add styles to a JavaFX button by using css styles. Below step by step procedure shows you how to add styles to a button using style sheets.

Step 1: Define styles in a css file. For example, I defined in demo.css file

demo.css

.buttonClass1{

    -fx-font: 40 arial;

    -fx-base: #00ff00;   

}

Step 2: Add the css file to Scene object

Scene scene = new Scene(vBox, 400, 400);

scene.getStylesheets().add(new File(cssFilePath).toURI().toURL().toExternalForm());

Step 3: Add the style to Button instance.

Button button = new Button("Click Me");

button.getStyleClass().add("buttonClass1");

Find the below working application.

ButtonApp.java

package com.sample.demos;

import static javafx.geometry.Pos.CENTER;

import java.io.File;
import java.io.FileNotFoundException;
import java.net.MalformedURLException;

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

public class ButtonApp extends Application {
 private static String cssFilePath = "C:\\Users\\krishna\\Documents\\Study\\javaFX\\demo.css";

 @Override
 public void start(Stage primaryStage) throws FileNotFoundException, MalformedURLException {

  Button button = new Button("Click Me");
  button.getStyleClass().add("buttonClass1");

  VBox vBox = new VBox(10, button);
  vBox.setAlignment(CENTER);

  Scene scene = new Scene(vBox, 400, 400);
  scene.getStylesheets().add(new File(cssFilePath).toURI().toURL().toExternalForm());

  /* Set the scene to primaryStage, and call the show method */
  primaryStage.setTitle("JavaFX Button Example");
  primaryStage.setScene(scene);
  primaryStage.show();
 }

}

TestFX.java

package com.sample.demos;

import javafx.application.Application;

public class TestFX {
 public static void main(String args[]) {
  Application.launch(ButtonApp.class, args);
 }
}

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