close a window and do not exit the application - javafx-8

Question

Good evening everyone,
I have a test application consists of two windows: Main, Window1.
to display the "Window1" window from the main window I click on a button. My problem is that closing the "window1" window automatically close the application. I would like when I click on (X) of the window "window1" I have to return to the main window (not exit the application).
here is the code:
MainScreen.fxml
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="166.0" prefWidth="307.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="testexample.MainScreenController">
<children>
<Button layoutX="128.0" layoutY="127.0" mnemonicParsing="false" onAction="#showScreen1" prefHeight="25.0" prefWidth="57.0" text="show..." />
<Label layoutX="114.0" layoutY="31.0" text="Main Screen">
<font>
<Font size="25.0" />
</font>
</Label>
</children>
</AnchorPane>
MainScreenController
public class MainScreenController implements Initializable {
/**
* Initializes the controller class.
*/
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
#FXML
private void showScreen1(ActionEvent event) throws IOException {
Parent root = (Parent) FXMLLoader.load(getClass().getResource("Screen1.fxml"));
Scene scene = new Scene(root);
Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
stage.setScene(scene);
stage.show();
}}
Screen1.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="202.0" prefWidth="463.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="testexample.Screen1Controller">
<children>
<Label layoutX="58.0" layoutY="40.0" prefHeight="53.0" prefWidth="342.0" text="Welcome to screen 1">
<font>
<Font size="36.0" />
</font>
</Label>
</children>
</AnchorPane>
class that contains method start() and method main():
public class TestExample extends Application {
#Override
public void start(Stage stage) throws IOException {
AnchorPane root = (AnchorPane)FXMLLoader.load(getClass().getResource("MainScreen.fxml"));
Scene sc = new Scene(root);
stage.setScene(sc);
stage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}

Answer 1

By default, a JavaFX application will exit when all windows are closed. You can prevent this behavior by calling
Platform.setImplicitExit(false);
in your Application's start(...) method.
I'm not sure this is your problem, however, because nowhere in your code do you create a second window: you just load up a new FXML file, put its contents in a new Scene, and display it in the existing window:
#FXML
private void showScreen1(ActionEvent event) throws IOException {
// Load new FXML file and save root Node as "root":
Parent root = (Parent) FXMLLoader.load(getClass().getResource("Screen1.fxml"));
// Create a new Scene to display the root node just loaded:
Scene scene = new Scene(root);
// Get a reference to the existing stage (the window containing the source of the event; the "show..." Button)
Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
// Set the new scene in the existing stage:
stage.setScene(scene);
// Show the existing stage (though it is already showing, I think):
stage.show();
}
From your description, it sounds like you want to create a second window, which the user has to dismiss before returning to the original window. You can do this by creating a new stage, making its owner the existing stage, and making it modal:
#FXML
private void showScreen1(ActionEvent event) throws IOException {
Parent root = (Parent) FXMLLoader.load(getClass().getResource("Screen1.fxml"));
Scene scene = new Scene(root);
Window existingWindow = ((Node) event.getSource()).getScene().getWindow();
// create a new stage:
Stage stage = new Stage();
// make it modal:
stage.initModality(Modality.APPLICATION_MODAL);
// make its owner the existing window:
stage.initOwner(existingWindow);
stage.setScene(scene);
stage.show();
}