Example files of JavaFX added from openjfx

src/main/java/fr/myny/gui/Gui.java

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+package fr.myny.gui;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+import java.io.IOException;
+
+public class Gui extends Application {
+
+    private static Scene scene;
+
+    @Override
+    public void start(Stage stage) throws IOException {
+        scene = new Scene(loadFXML("primary"));
+        stage.setScene(scene);
+        stage.show();
+    }
+
+    static void setRoot(String fxml) throws IOException {
+        scene.setRoot(loadFXML(fxml));
+    }
+
+    private static Parent loadFXML(String fxml) throws IOException {
+        FXMLLoader fxmlLoader = new FXMLLoader(Gui.class.getResource(fxml + ".fxml"));
+        return fxmlLoader.load();
+    }
+
+    public static void main(String[] args) {
+        launch();
+    }
+}

src/main/java/fr/myny/gui/PrimaryController.java

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+package fr.myny.gui;
+
+import javafx.fxml.FXML;
+
+import java.io.IOException;
+
+public class PrimaryController {
+
+    @FXML
+    private void switchToSecondary() throws IOException {
+        Gui.setRoot("secondary");
+    }
+}

src/main/java/fr/myny/gui/SecondaryController.java

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+package fr.myny.gui;
+
+import javafx.fxml.FXML;
+
+import java.io.IOException;
+
+public class SecondaryController {
+
+    @FXML
+    private void switchToPrimary() throws IOException {
+        Gui.setRoot("primary");
+    }
+}

src/main/java/module-info.java

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+module fr.myny.gui {
+    requires javafx.controls;
+    requires javafx.fxml;
+
+    opens fr.myny.gui to javafx.fxml;
+    exports fr.myny.gui;
+}