Create a Grid Layout and Light Toggling Buttons

Grid layout

A grid layout arranges components into a grid in which all components are the same size.

Adding LightButtons to Framed

1. In framed.java, Add a private static final integer instance variable called GRIDSIZE, set to 3.
2. Add a private LightButton two-dimensional array instance variable called lightButton, with GRIDSIZE rows and GRIDSIZE columns.

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public class Framed extends JFrame {
  private static final long serialVersionUID = 1L;
  ____________________ GRIDSIZE = _____;
  ____________________[][] lightButton = ____________________;
 
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