JavaFX GridPane set gap

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.layout.GridPane;
import javafx.scene.control.TextField;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.geometry.Insets;

public class Main extends Application {
  @Override//  w  w  w. j  a v a 2 s.c o m
  public void start(Stage primaryStage) {
    // Create a GridPane and set its properties
    GridPane pane = new GridPane();
    pane.setPadding(new Insets(5, 5, 5, 5));
    pane.setHgap(5);
    pane.setVgap(5);

    // Place text fields containing a centered, 
    // randomly generated string of 0 or 1 in the pane
    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        TextField text = new TextField();
        text.setPrefColumnCount(1);
        text.setText(String.valueOf((int)(Math.random() * 2)));
        pane.add(text, i, j);
        pane.setHalignment(text, HPos.CENTER);
        pane.setValignment(text, VPos.CENTER);
      }
    }

    // Create a scene and plane it in the stage
    Scene scene = new Scene(pane);
    primaryStage.setTitle("Exercise_14_07");
    primaryStage.setScene(scene);
    primaryStage.show();
  }
}