How to restart a JavaFX application when a button is clicked

Question

I looked through almost every post on this subject, but most of them do not explain what to do correctly. To the question:

I created the javaFX application, a dice game, a human player against the computer, but at any time, playing a game, a human player should be able to click the "new game" button, and what needs to be done is to restart the game from the beginning.

I tried to start the stage again, but in javafx we cannot call the launch method twice.

1) Is there a way to implement this without restarting the entire application?

2) if not, how can I completely restart the application by pressing a button?

Main class

public class Main {
public static void main(String[] args) {
    GameUI gameUI = new GameUI();

    gameUI.launch(GameUI.class, args);

}   

GameUI ( , . , , , . , .)

public class GameUI extends Application  {

 //all btn and label declarations 
//creating instances for necessary classes

private Scene scene;

@Override
public void start(Stage primaryStage) throws Exception {

    //Displaying Dice for Player and Computer
    setLabelsPlyr(diesP);
    setLabels(diesC);

    btnThrow = new Button("Throw");
    btnThrow.setPrefSize(70, 40);

    //Throw action is performed
    btnThrow.setOnAction(e -> {

    //setting and displaying dies
      DieClass[] com = getNewDiceArrC();  
      lblDiceOneC.setGraphic(new ImageView(diesC[0].getDieImageC()));
      //so on.....

      DieClass[] playerAr = getNewDiceArrP();
      lblDiceOnePlyr.setGraphic(new ImageView(diesP[0].getDieImageP()));
      //so on...
    });

    btnNewGame = new Button("New Game");
    btnNewGame.setOnAction(e -> {

           **//WHAT TO DO HERE?????**

    });

    //setting layouts


    GridPane gridPane = new GridPane();
    gridPane.add(lblComputer, 0, 0);
    //so on.....

    Scene scene = new Scene(gridPane, 1100, 400);
    primaryStage.setScene(scene);
    primaryStage.setTitle("dice Game");
    primaryStage.show();

}

//some other methods
public void setLabels(DieClass[] dies) {
    for (int i=0; i < dies.length; i++) {
        lblDiceOneC = new Label();
        lblDiceOneC.setGraphic(new ImageView(dies[0].getDieImageC()));
        ++i;
       //so on.....

        break;
    }
}

public void setLabelsPlyr(DieClass[] dies){
    for (int i=0; i<dies.length; i++) {
        lblDiceOnePlyr = new Label();
        lblDiceOnePlyr.setGraphic(new ImageView(dies[0].getDieImageP()));
        ++i;
        lblDiceTwoPlyr = new Label();
        //so on......
        break;
    }
}

p.s JavaFX Java.

Answer 1

, . - :

void cleanup() {
    // stop animations reset model ect.
}

void startGame(Stage stage) {
    // initialisation from start method goes here

    btnNewGame.setOnAction(e -> {
       restart(stage);
    });

    stage.show();
}

void restart(Stage stage) {
    cleanup();
    startGame(stage);
}

@Override
public void start(Stage primaryStage) {
    startGame(primaryStage);
}

• , , , ( , ). ( , , ).
• launch() - static, . Application.launch(GameUI.class, args); GameUI.
• , . , , Application.