Get Even More Visitors To Your Blog, Upgrade To A Business Listing >>

JavaFX: Event Handling using method reference

 

Step 1: Define a method that handles event.

private Void buttonHandler(ActionEvent event) {

         System.out.println("button clicked");

}

 

Step 2: Set the method ‘buttonHandler’ using method reference on action event.

button1.setOnAction(this::buttonHandler);

 

Find the below working application.

 

EventHandlingByMethodReference.java

package com.sample.app.eventhandling;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.effect.DropShadow;
import javafx.scene.layout.FlowPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.stage.Stage;

public class EventHandlingByMethodReference extends Application {

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

private void buttonHandler(ActionEvent event) {
System.out.println("button clicked");
}

@Override
public void start(Stage primaryStage) throws Exception {
DropShadow dropShadow = new DropShadow();
dropShadow.setOffsetX(5);
dropShadow.setOffsetY(5);
dropShadow.setColor(Color.GRAY);

Button button1 = new Button("Click Me");
button1.setTextFill(Color.BLACK);
button1.setFont(Font.font("Verdana", FontPosture.REGULAR, 35));

button1.setOnAction(this::buttonHandler);

FlowPane.setMargin(button1, new Insets(50, 50, 50, 50));

FlowPane flowPane = new FlowPane();
flowPane.setOrientation(Orientation.HORIZONTAL);
flowPane.setEffect(dropShadow);
flowPane.getChildren().add(button1);

Scene scene = new Scene(flowPane, 500, 400, Color.LIGHTYELLOW);

primaryStage.setTitle("Event Handling Demo");
primaryStage.setScene(scene);
primaryStage.show();
}
}

 

Output

 

 



Whenever you click on the button ‘Click Me’, you will see below message in the console.

 

button clicked

Previous                                                    Next                                                    Home


This post first appeared on Java Tutorial : Blog To Learn Java Programming, please read the originial post: here

Share the post

JavaFX: Event Handling using method reference

×

Subscribe to Java Tutorial : Blog To Learn Java Programming

Get updates delivered right to your inbox!

Thank you for your subscription

×