[[oktatas:programozás:java:java_fx|< Java FX]]

====== Java FX Példák ======

  * **Szerző:** Sallai András
  * Copyright (c) Sallai András, 2021
  * Licenc: [[https://creativecommons.org/licenses/by-sa/4.0/|CC Attribution-Share Alike 4.0 International]]
  * Web: https://szit.hu

===== Nyomógomb =====


<code java App.java>
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.control.Button;

public class App extends Application implements EventHandler<ActionEvent> {

    Button button;

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

    @Override
    public void start(Stage stage) {
        button = new Button();
        button.setText("Katt");
        button.setOnAction(this);
        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Helló Világ!");
        stage.show();
    }

    @Override
    public void handle(ActionEvent event) {
        if (event.getSource() == button) {
            System.out.println("Kattintás volt");
        }

    }

}

</code>


===== Lambda =====

<code java App.java>
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.control.Button;

public class App extends Application {

    Button button;

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

    @Override
    public void start(Stage stage) {
        button = new Button();
        button.setText("Katt");
        button.setOnAction(e -> System.out.println("Kattintás volt"));
        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Helló Világ!");
        stage.show();
    }
}

</code>


Több utasítás is megadható:

<code java>
        button.setOnAction(e -> {
            System.out.println("Kattintás volt");
            System.out.println("Kattintás volt");
        });
</code>