public class Statistics extends JApplet {
  JTextArea  Xout  = new JTextArea(20, 50);
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(new JLabel("Statistics!"));
    cp.add(new JScrollPane(Xout));
    
    HashMap hm = new HashMap();
    for(int i = 0; i < 20000000; i++) {
      // Produce a number between 0 and 20:
      Integer r = 
        new Integer((int)(Math.random() * 20));
      if(hm.containsKey(r))
        ((Counter)hm.get(r)).i++;
      else
        hm.put(r, new Counter());
    }
    System.out.println(hm) ;
    for(int i = 0; i < 20; i++) {
      Integer r =  new Integer((int)(i));
      if(hm.containsKey(r)){
         Counter c = (Counter)hm.get(r);
         Xout.append (r + " -> " + c + "\n");
      }
    }
    
  }

class Counter { 
  int i = 1; 
  public String toString() { 
    return Integer.toString(i); 
  }
}
public static void main(String[] args) {
        Console.run(new Statistics(), 600, 400);
}

} ///:~