Button: A button in JavaFX application enables that application to perform some action when the user clicks the button. The button control is represented by the class "javafx.scene.control.Button".

Syntax:

Button button_Object = new Button ("text");

Here, "button_Object" is an instance of "Button" control. "text" in the syntax is used to display that text on the button.

GridPane:

• It is used to display nodes as a grid of rows and columns.
• Syntax: GridPane gridpane_Object = new GridPane ();
• In the "GridPane" object, the control object is given as the first argument, the index of the column is given as the second argument and the index of the row is given as the third argument.
• Example: gridpane_Object.add (control, column, row);

Algorithm to add button to the "GridPane" at 2^nd column and 5^th row:

Step 1: Create a "GridPane" object named "gridPane".

Step 2: Create a "Button" object named "button".

Step 3: Add the button control as the first argument using "add ()" method.

Step 4: In the same statement, give the column’s index value "2" as the second argument and row’s index value "5" as the third argument...