Understanding this message panel with the set font

Question

heyall, can someone explain to me how this messagepanel class works with setNewFont class, I cannot understand the correlation in the below lines?? i.e. there is no getFont class in the messagepanel so why use it?what does it do?
//Set font for the message
        Font font = messagePanel.getFont();
        messagePanel.setFont(new Font(font.getName(),fontStyle, font.getSize()));
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CheckBoxDemo  extends ButtonDemo{
    //Create three check boxes to control the display of message
    private JCheckBox jchkCentered = new JCheckBox("Centered");
    private JCheckBox jchkBold = new JCheckBox("Bold");
    private JCheckBox jchkItalic = new JCheckBox("Italic");
    public static void main(String[]args){
        CheckBoxDemo frame = new CheckBoxDemo();
        frame.setTitle("CheckBoxDemo");
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500,200);
        frame.setVisible(true);
    public CheckBoxDemo() {
        //Set mnemonic keys
        jchkCentered.setMnemonic('C');
        jchkBold.setMnemonic('B');
        jchkItalic.setMnemonic('I');
        //Create a new panel to hold check boxes
        JPanel jpCheckBoxes = new JPanel();
        jpCheckBoxes.setLayout(new GridLayout(3,1));
        jpCheckBoxes.add(jchkCentered);
        jpCheckBoxes.add(jchkBold);
        jpCheckBoxes.add(jchkItalic);
        add(jpCheckBoxes,BorderLayout.EAST);
        //Registar listeners with checkboxes
        jchkCentered.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                messagePanel.setCentered(jchkCentered.isSelected());
                jchkCentered.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                setNewFont();
                jchkCentered.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                setNewFont();
    private void setNewFont() {
        int fontStyle = Font.PLAIN;
        fontStyle += (jchkBold.isSelected() ? Font.BOLD : Font.PLAIN);
        fontStyle += (jchkItalic.isSelected() ? Font.BOLD : Font.PLAIN);
        //Set font for the message
        Font font = messagePanel.getFont();
        messagePanel.setFont(new Font(font.getName(),fontStyle, font.getSize()));
import java.awt.FontMetrics;
  import java.awt.Dimension;
  import java.awt.Graphics;
  import javax.swing.JPanel;
  public class MessagePanel extends JPanel{
    /** The message to be displayed */
    private String message = "Welcome to Java";
    /** The x coordinate where the message is displayed */
    private int xCoordinate = 20;
    /** The y coordinate where the message is displayed */
    private int yCoordinate = 20;
    /** Indicate whether the message is displayed in the center */
    private boolean centered;
    /** The interval for moving the message horizontally and vertically */
    private int interval = 10;
    /** Construct with default properties */
  //  public MessagePanel() {
    /** Construct a message panel with a specified message */
    public MessagePanel(String message) {
      this.message = message;
    /** Return message */
    public String getMessage() {
      return message;
    /** Set a new message */
    public void setMessage(String message) {
      this.message = message;
      repaint();
    /** Return xCoordinator */
    public int getXCoordinate() {
      return xCoordinate;
    /** Set a new xCoordinator */
    public void setXCoordinate(int x) {
      this.xCoordinate = x;
      repaint();
    /** Return yCoordinator */
    public int getYCoordinate() {
      return yCoordinate;
    /** Set a new yCoordinator */
    public void setYCoordinate(int y) {
      this.yCoordinate = y;
      repaint();
   /** Return centered */
    public boolean isCentered() {
      return centered;
    /** Set a new centered */
    public void setCentered(boolean centered) {
      this.centered = centered;
      repaint();
    /** Return interval */
    public int getInterval() {
      return interval;
    /** Set a new interval */
    public void setInterval(int interval) {
      this.interval = interval;
      repaint();
    /** Paint the message */
    protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      if (centered) {
        // Get font metrics for the current font
        FontMetrics fm = g.getFontMetrics();
        // Find the center location to display
        int stringWidth = fm.stringWidth(message);
        int stringAscent = fm.getAscent();
        // Get the position of the leftmost character in the baseline
        xCoordinate = getWidth() / 2 - stringWidth / 2;
        yCoordinate = getHeight() / 2 + stringAscent / 2;
      g.drawString(message, xCoordinate, yCoordinate);
    /** Move the message left */
    public void moveLeft() {
      xCoordinate -= interval;
      repaint();
    /** Move the message right */
    public void moveRight() {
      xCoordinate += interval;
      repaint();
    /** Move the message up */
    public void moveUp() {
      yCoordinate -= interval;
      repaint();
    /** Move the message down */
    public void moveDown() {
     yCoordinate += interval;
      repaint();
    /** Override get method for preferredSize */
    public Dimension getPreferredSize() {
      return new Dimension(200, 30);
  }

Answer 1

ah right so because there is an import fontmetrics api attached to that is a getFont method......i see now