Java AWT FontMetrics from Graphics

// FontMetrics and Graphics methods useful for obtaining font metrics.
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {
  // display font metrics
  @Override/*from  w w w  .j a  v  a  2  s.  c  o m*/
  public void paintComponent(Graphics g) {
    super.paintComponent(g);

    g.setFont(new Font("SansSerif", Font.BOLD, 12));
    FontMetrics metrics = g.getFontMetrics();
    g.drawString("Current font: " + g.getFont(), 10, 30);
    g.drawString("Ascent: " + metrics.getAscent(), 10, 45);
    g.drawString("Descent: " + metrics.getDescent(), 10, 60);
    g.drawString("Height: " + metrics.getHeight(), 10, 75);
    g.drawString("Leading: " + metrics.getLeading(), 10, 90);

    Font font = new Font("Serif", Font.ITALIC, 14);
    metrics = g.getFontMetrics(font);
    g.setFont(font);
    g.drawString("Current font: " + font, 10, 120);
    g.drawString("Ascent: " + metrics.getAscent(), 10, 135);
    g.drawString("Descent: " + metrics.getDescent(), 10, 150);
    g.drawString("Height: " + metrics.getHeight(), 10, 165);
    g.drawString("Leading: " + metrics.getLeading(), 10, 180);
  }

  public static void main(String[] args) {
    // create frame for Main
    JFrame frame = new JFrame("Demonstrating FontMetrics");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Main Main = new Main();
    frame.add(Main);
    frame.setSize(510, 240);
    frame.setVisible(true);
  }
}