JavaFX: Button: Perform action on button click

JavaFX provides setOn* methods to receive events from the user interactions.

For example, below snippet set the text of label when user clicks on the button.

button.setOnAction((ActionEvent e) -> {

         label.setText("You clicked");

});

Find the below working application.

ButtonApp.java

package com.sample.demos;

import static javafx.geometry.Pos.CENTER;

import java.io.FileNotFoundException;

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

public class ButtonApp extends Application {

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

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

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

  Scene scene = new Scene(vBox, 400, 400);
  
  button.setOnAction((ActionEvent e) -> {
      label.setText("You clicked");
  });
  
  /* 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);
 }
}

When you ran above application, you can able to see below window.

When you click on the button ‘Click Me’, the window adds label to the content pane.

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