Delaying the execution of a function until string value is returned from javafx window

Question

In my program the user the user enters a password on an external window, and then that password is passed through a function. The problem is that the function is executed before the user can enter a password. Here is my password window. Passw has already been declared as a static string for the class

public static String enterPassword()
{

    Stage primaryStage = new Stage();

    VBox vb = new VBox();

    vb.setPadding(new Insets(10, 0, 0, 10));

    vb.setSpacing(10);

    HBox hb = new HBox();

    hb.setSpacing(10);

    hb.setAlignment(Pos.CENTER_LEFT);

    Label label = new Label("Password");

    final PasswordField pb = new PasswordField();

    final TextField textField = new TextField();

    textField.setManaged(false);

    textField.setVisible(false);

    CheckBox checkBox = new CheckBox("Show/Hide password");

    textField.managedProperty().bind(checkBox.selectedProperty());


    textField.visibleProperty().bind(checkBox.selectedProperty());


    pb.managedProperty().bind(checkBox.selectedProperty().not());

    pb.visibleProperty().bind(checkBox.selectedProperty().not());

    // Bind the textField and passwordField text values 
    bidirectionally.

    textField.textProperty().bindBidirectional(pb.textProperty());

    pb.setOnAction(e -> 
    {

        passw = pb.getText();




       pb.clear();
       primaryStage.hide();

    });

    textField.setOnAction(e -> 
    {

        passw = textField.getText();

        textField.clear();

        primaryStage.hide();
    });

    hb.getChildren().addAll(label, pb, textField, checkBox);
    vb.getChildren().addAll(hb);
    Scene scene = new Scene(vb, 450, 90);
    primaryStage.setScene(scene);


    primaryStage.show();



    return passw;

}

And here is the code in main where the function hostRun is executed

password = enterPassword();

while(password == null)
{

}

hostRun(4000000, '0', index, password, 0);

Here I try a while loop to delay the execution of hostRun but even that causes the password window to crash. How do I delay the execution of hostRun until the user enters a password?

Answer 1

If you want to pause your program until the stage closed you can do that with:

primaryStage.showAndWait();

This will pause the method that invoked the stage until it closes. No need for a loop. Then enterPassword() will wait until the stage closes.