import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.shape.Rectangle;

public class Scener extends Application{
    public void start(Stage stage){

        // Scene 1
        Button knapp1 = new Button("Trykk her");
        Pane root1 = new Pane(knapp1);
        Scene scene1 = new Scene(root1);

        // Scene 2
        Button knapp2 = new Button("Ikke trykk her!");
        TextField tekstfelt = new TextField();
        Rectangle firkant = new Rectangle(50, 50);
        VBox root2 = new VBox(knapp2, tekstfelt, firkant);
        Scene scene2 = new Scene(root2);
        firkant.setOnMouseClicked(e -> {
            knapp2.setText(tekstfelt.getText());
        });

        knapp1.setOnAction(e -> {
            stage.setScene(scene2);
        });

        stage.setScene(scene1);
        stage.setTitle("Sceneprogram");
        stage.show();
    }
}