Bottoni

package pkg9.buttons;


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


public class Buttons extends Application {
    //Button btn = null;
    @Override
    public void start(Stage stage){
        GridPane root = new GridPane();
        int cont = 0;
        Button b0 = new Button("       \n   0   \n       ");
        b0.setOnAction(event -> {
            if(b0.visibleProperty()){
                b0.setVisible(true);} else {
                b0.setVisible(false);
            }});
        Button b1 = new Button("       \n   1   \n       ");
        b1.setOnAction(event -> {b1.setVisible(false);});
        Button b2 = new Button("       \n   2   \n       ");
        b2.setOnAction(event -> {b2.setVisible(false);});
        Button b3 = new Button("       \n   3   \n       ");
        b3.setOnAction(event -> {b3.setVisible(false);});
        Button b4 = new Button("       \n   4   \n       ");
        b4.setOnAction(event -> {b4.setVisible(false);});
        Button b5 = new Button("       \n   5   \n       ");
        b5.setOnAction(event -> {b5.setVisible(false);});
        Button b6 = new Button("       \n   6   \n       ");
        b6.setOnAction(event -> {b6.setVisible(false);});
        Button b7 = new Button("       \n   7   \n       ");
        b7.setOnAction(event -> {b7.setVisible(false);});
        Button b8 = new Button("       \n   8   \n       ");
        b8.setOnAction(event -> {b8.setVisible(false);});
        root.add(b0, 0, 0);
        root.add(b1, 1, 0);
        root.add(b2, 2, 0);
        root.add(b3, 0, 1);
        root.add(b4, 1, 1);
        root.add(b5, 2, 1);
        root.add(b6, 0, 2);
        root.add(b7, 1, 2);
        root.add(b8, 2, 2);
        /*
        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 3; j++){
                btn = new Button(String.valueOf(cont++));
                btn.setOnAction(event -> {
                    root.visibleProperty();
                });
                root.add(btn, j, i);
            }
        }*/
        Scene scene = new Scene(root, 200, 200);
        stage.setScene(scene);
        stage.show();
    }

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

}