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import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

/**
 *
 * @author olivi
 */
public class HelloGUIWorld extends Application {

    private GridPane root;
    private Button button;
    private Button button2;

    @Override
    public void start(Stage primaryStage) {

        root = new GridPane();

        button2 = new Button();
        button2.setStyle("-fx-background-color: MediumSeaGreen");
        button2.setPrefSize(40, 40);
        button2.addEventHandler(ActionEvent.ACTION, new ButtonClickHandler());

        button = new Button();
        button.setStyle("-fx-background-color: MediumSeaGreen");
        button.setPrefSize(40, 40);

        //root.getChildren().add(button2);
        //root.getChildren().add(button);
        root.add(button2, 1, 1);
        root.add(button, 2, 2);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("Memory!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private class ButtonClickHandler implements EventHandler<ActionEvent> {

        @Override
        public void handle(ActionEvent event) {

            Image image = new Image(this.getClass().getResource("resorces/apple.png").toString());
            ImageView secondView = new ImageView();
            secondView.setFitHeight(20);
            secondView.setFitWidth(20);
            secondView.setImage(image);
            button2.setGraphic(secondView);
        }

    }

    private void showMessage(String message) {
        Alert alert = new Alert(Alert.AlertType.INFORMATION);
        alert.setTitle("Information");
        alert.setHeaderText("Message from application");
        alert.setContentText(message);
        alert.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}