Tool for word cube puzzle

package gui;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.util.HashMap;

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

public class WordCubes
{
    static Point select;

    public static void main(String[] args)
    {
        final String[] words = "BUNK CAVE CRUX DOZE FIST GLAD HARM PLUM TIRE TUCK WOLF ZANY".split(" ");
        final HashMap<Character,Point> tokens = new HashMap<Character,Point>();
        for(String s : words)
            for(Character l : s.toCharArray())
                tokens.put(l, new Point((int)(100+600*Math.random()),(int)(100+400*Math.random())));
        final JFrame f = new JFrame("word cubes");
        final JPanel p = new JPanel() {
            public void paintComponent(Graphics g) {
                g.setColor(new Color(0));
                g.fillRect(0,0,getWidth(),getHeight());
                g.setColor(new Color(0x000033));
                if(select != null)
                    g.fillOval(select.x-20, select.y-20, 40, 40);
                g.setColor(new Color(0xffffff));
                g.setFont(new Font("monospace",Font.BOLD,20));
                for(Character l : tokens.keySet())
                    g.drawString(l.toString(), tokens.get(l).x-5, tokens.get(l).y+5);
                g.setColor(new Color(0x006600));
                for(String s : words)
                    for(int i=0 ; i<s.length() ; i++)
                        for(int j=i+1 ; j<s.length() ; j++)
                            g.drawLine(tokens.get(s.charAt(i)).x,tokens.get(s.charAt(i)).y,tokens.get(s.charAt(j)).x,tokens.get(s.charAt(j)).y);
            }
        };
        p.addMouseMotionListener(new MouseMotionListener() {
            public void mouseMoved(MouseEvent e) {
                select = null;
                for(Point p : tokens.values())
                    if(p.distanceSq(e.getPoint()) < 200)
                        select = p;
                p.repaint();
            }
            public void mouseDragged(MouseEvent e) {
                if(select != null)
                    select.setLocation(e.getPoint());
                p.repaint();
            }
        });
        f.setContentPane(p);
        f.setVisible(true);
        f.setSize(800,600);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}