Java AWT FontMetrics multiple line text alignment

// Demonstrate text alignment. 

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.StringTokenizer;

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

class Demo extends JPanel {
   final int LEFT = 0;
   final int RIGHT = 1;
   final int CENTER = 2;
   final int LEFTRIGHT = 3;
   int align;/*from  w  w w . j a v  a2s  .com*/
   Dimension d;
   Font f;
   FontMetrics fm;
   int fontSize;
   int fh, bl;
   int space;
   String text;

   public Demo() {
      setBackground(Color.white);
      text = "demo2s.com <p> demo2s.com this is a test <p> demo2s.com <p> demo2s.com <p>";
      fontSize = 14;
      align = LEFT;
      addMouseListener(new MyMouseAdapter(this));
   }

   public void paint(Graphics g) {
      update(g);
   }

   public void update(Graphics g) {
      d = getSize();
      g.setColor(getBackground());
      g.fillRect(0, 0, d.width, d.height);
      if (f == null)
         f = new Font("New Roman", Font.PLAIN, fontSize);
      g.setFont(f);
      if (fm == null) {
         fm = g.getFontMetrics();
         bl = fm.getAscent();
         fh = bl + fm.getDescent();
         space = fm.stringWidth(" ");
      }

      g.setColor(Color.black);
      StringTokenizer st = new StringTokenizer(text);
      int x = 0;
      int nextx;
      int y = 0;
      String word, sp;
      int wordCount = 0;
      String line = "";
      while (st.hasMoreTokens()) {
         word = st.nextToken();
         if (word.equals("<P>")) {
            drawString(g, line, wordCount, fm.stringWidth(line), y + bl);
            line = "";
            wordCount = 0;
            x = 0;
            y = y + (fh * 2);
         } else {
            int w = fm.stringWidth(word);
            if ((nextx = (x + space + w)) > d.width) {
               drawString(g, line, wordCount, fm.stringWidth(line), y + bl);
               line = "";
               wordCount = 0;
               x = 0;
               y = y + fh;
            }
            if (x != 0) {
               sp = " ";
            } else {
               sp = "";
            }
            line = line + sp + word;
            x = x + space + w;
            wordCount++;
         }
      }
      drawString(g, line, wordCount, fm.stringWidth(line), y + bl);
   }

   public void drawString(Graphics g, String line, int wc, int lineW, int y) {
      switch (align) {
      case LEFT:
         g.drawString(line, 0, y);
         break;
      case RIGHT:
         g.drawString(line, d.width - lineW, y);
         break;
      case CENTER:
         g.drawString(line, (d.width - lineW) / 2, y);
         break;
      case LEFTRIGHT:
         if (lineW < (int) (d.width * .75)) {
            g.drawString(line, 0, y);
         } else {
            int toFill = (int) ((d.width - lineW) / wc);
            int nudge = d.width - lineW - (toFill * wc);
            int s = fm.stringWidth(" ");
            StringTokenizer st = new StringTokenizer(line);
            int x = 0;
            while (st.hasMoreTokens()) {
               String word = st.nextToken();
               g.drawString(word, x, y);
               if (nudge > 0) {
                  x = x + fm.stringWidth(word) + space + toFill + 1;
                  nudge--;
               } else {
                  x = x + fm.stringWidth(word) + space + toFill;
               }
            }
         }
         break;
      }

   }

}
class MyMouseAdapter extends MouseAdapter {
   Demo tl;

   public MyMouseAdapter(Demo tl) {
      this.tl = tl;
   }

   public void mouseClicked(MouseEvent me) {
      tl.align = (tl.align + 1) % 4;
      tl.repaint();
   }
}

public class Main {
   public static void main(String[] args) {
      Demo panel = new Demo();

      JFrame application = new JFrame();

      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      application.add(panel);
      application.setSize(250, 250);
      application.setVisible(true);
   }
}