I am trying to build a GUI stack using JavaFX. I am supposed to ask the user how many elements he wants for the stack. Then, number of TextFields should appear on the right screen based on the size of user's entry. I have been trying all day and still nothing works.

Here is what I have been trying to do so far. after I solve TextFields array issue, I should complete my program.

`

public class StackGUI extends Application{
    private Button push, pop, peek, empty, create, build ;
    private TextField[] data ;
    private TextField size, numberText ;
    private Label sizeLabel, numberLabel ;
    private int sizeOfStack ;
    String sizeDialog = "0" ;
    
    
    @Override
    public void start(Stage primaryStage){

        BorderPane border = new BorderPane();
        
        // Buttons
        push = new Button("PUSH");
        pop = new Button("POP");
        peek = new Button("PEEK");
        empty = new Button("EMPTY");
        push.setPrefSize(150, 50);
        pop.setPrefSize(150, 50);
        peek.setPrefSize(150, 50);
        empty.setPrefSize(150, 50);
        FlowPane bottom = new FlowPane();
        bottom.setHgap(10);
        bottom.setAlignment(Pos.CENTER);
        bottom.getChildren().addAll(push, pop, peek, empty) ;
        border.setBottom(bottom);
        
        
        //Center
        VBox center = new VBox(5);
        center.setAlignment(Pos.CENTER);
        size = new TextField();
        size.setMaxWidth(200);
        size.setEditable(false);
        numberLabel = new Label("Enter a numbet: ");
        numberText = new TextField();
        numberText.setMaxWidth(200) ;
        //sizeLabel = new Label("How many numbers? ");
        create = new Button("Create a Stack");
        build = new Button("Build the Stack");
        create.setPrefWidth(200);
        build.setPrefWidth(200);
        build.setDisable(true);
        center.getChildren().addAll(create, size, build) ;
        border.setCenter(center);
        
        
        //Stack TextFields --> right
         
        create.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                TextInputDialog input = new TextInputDialog();
                
                input.setContentText("How many Numbers");
                input.setHeaderText("Size Of Stack");
                input.setTitle("Stack");
                input.showAndWait();
                size.setAlignment(Pos.CENTER);
                size.setText("Number Of Elements: "   input.getEditor().getText());
                sizeDialog = input.getEditor().getText() ;
                build.setDisable(false);
            }
        });
        
        sizeOfStack = Integer.parseInt(sizeDialog) ;
        data = new TextField[sizeOfStack] ;
        HBox right = new HBox(5);
        build.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                create.setDisable(true);
                numberText.setPromptText("Enter a number to push");
                center.getChildren().addAll(numberLabel, numberText) ;
                for(int i=0 ; i<sizeOfStack ; i  ){
                    TextField text = new TextField();
                    data[i] = text ;
                    right.getChildren().add(data[i]) ;
                }
            }
        });
        border.setRight(right);
        
        //Scene
        Scene scene = new Scene(border, 800, 400) ;
        primaryStage.setScene(scene);
        primaryStage.setTitle("Stack");
        primaryStage.show();

    }

    
    public static void main(String[] args) {
        launch(args); 
    }
    
}

`

CodePudding user response：

As @James_D pointed out, you need to move sizeOfStack = Integer.parseInt(sizeDialog); inside of build.setOnAction. You also need to move data = new TextField[sizeOfStack] ;.

I also moved HBox right = new HBox(sizeOfStack); and border.setRight(right);, but that may not have been necesary.

Code:

build.setOnAction((ActionEvent event) - > {
    sizeOfStack = Integer.parseInt(sizeDialog);
    data = new TextField[sizeOfStack];

    create.setDisable(true);
    numberText.setPromptText("Enter a number to push");
    center.getChildren().addAll(numberLabel, numberText);

    HBox right = new HBox(sizeOfStack);
    for (int i = 0; i < sizeOfStack; i  ) {
        TextField text = new TextField();
        data[i] = text;
        right.getChildren().add(data[i]);
    }
    border.setRight(right);
});