According to this cord please give me this 2 question answer.

package Program_07;

import javax.swing.*;

import javax.swing.border.Border;

import javax.swing.border.EmptyBorder;

import javax.swing.border.LineBorder;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class SudokuLayout extends JFrame {

/** Author Tri Nguyen

*

*/

private static final long serialVersionUID = 1L;

private JTextField square[][][];

private JFrame frame = new JFrame ();

private JPanel main = new JPanel( new BorderLayout());

private JPanel p1,p2,panel[];

private JTextArea TxtAr;

JButton reset,hint,solve,puzzle;

JLabel difficulty;

JComboBox