F.java

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class F extends JFrame {
  JLabel label;

  F() {
    label = new JLabel("!") {
      @Override
      public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        Font font = label.getFont();
        FontMetrics fm = g.getFontMetrics(font);
        System.out.println("Font: " + fm.getFont());
        System.out.println("Size: " + font.getSize2D());
        System.out.println("Height: " + fm.getHeight());
        System.out.println("Ascent " + fm.getAscent());
        System.out.println("Descent: " + fm.getDescent());
        System.out.println("Leading: " + fm.getLeading());
        System.out.println("Max Advance: " + fm.getMaxAdvance());
        System.out.println("Max Ascent: " + fm.getMaxAscent());
        System.out.println("Max Descent: " + fm.getMaxDescent());
        dispose();
      }
    };
    add(label);
    pack();
    setVisible(true);
  }

  public static void main(String... args) { new F(); }
}