بناء حاسبة باستخدام JavaFX

To resolve the error you’re encountering, you need to understand that the setCenter method of BorderPane expects a single Node as an argument, not a 2D array of Button objects. To achieve your goal of using an array of buttons as a single object to place in the center of the pane, you can use a GridPane to layout your buttons in a grid-like manner. Here’s how you can modify your code:

java
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Calculator extends Application {

    @Override
    public void start(Stage primaryStage) {
        BorderPane pane = new BorderPane();
        TextField display = new TextField();
        pane.setTop(display);

        int rows = 4; // Number of rows for the grid
        int cols = 4; // Number of columns for the grid
        GridPane grid = new GridPane();

        // Create buttons and add them to the grid
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                Button button = new Button("Button " + (i * cols + j));
                grid.add(button, j, i); // Add button to grid at column j, row i
            }
        }

        pane.setCenter(grid);

        Scene scene = new Scene(pane, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

In this code, we use a GridPane to lay out the buttons in a grid. You can adjust the rows and cols variables to change the number of rows and columns in the grid. Each button is added to the grid at a specific column and row using the add method of GridPane. Finally, we set the GridPane as the center of the BorderPane.

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