switching betweeen scenes

[Elvishbee]

public void start(Stage primaryStage) {
    window = primaryStage;

    //Button 1
    Label label1 = new Label("Welcome to the first scene!");
    Button button1 = new Button("Create Account");
    button1.setOnAction(e -> window.setScene(scene2));

    //Layout 1 - children laid out in vertical column
    VBox layout1 = new VBox(30);
    layout1.getChildren().addAll(label1, button1);
    scene1 = new Scene(layout1, 200, 200);

    GridPane grid = new GridPane();
    grid.setPadding(new Insets(10, 10, 10, 10));
    grid.setVgap(8);
    grid.setHgap(10);

    //Name Label - constrains use (child, column, row)
    Label nameLabel = new Label("Username:");
    GridPane.setConstraints(nameLabel, 0, 0);

    //Name Input
    TextField nameInput = new TextField("Bucky");
    GridPane.setConstraints(nameInput, 1, 0);

    //Password Label
    Label passLabel = new Label("Password:");
    GridPane.setConstraints(passLabel, 0, 1);

    //Password Input
    TextField passInput = new TextField();
    passInput.setPromptText("password");
    GridPane.setConstraints(passInput, 1, 1);

    //Login
    Button loginButton = new Button("Log In");
    GridPane.setConstraints(loginButton, 1, 2);

    //Add everything to grid
    grid.getChildren().addAll(nameLabel, nameInput, passLabel, passInput, loginButton);

    Scene scene2 = new Scene(grid, 300, 200);

    

    //Display scene 1 at first
    window.setScene(scene1);
    window.setTitle("Project");
    window.show();
}

it does not switch to the scene where i have my textfields, what can i do?

[Buchx]

Your button1.setOnAction tries to show scene2, which you first initialize at 4th bottom line, that would return you a null.

Move the button1.setOnaction below Scene scene2 = new Scene(grid, 300, 200); and then it should work.

So in the end it should look like this:

Scene scene2 = new Scene(grid, 300, 200);
button1.setOnAction(e -> window.setScene(scene2));