//: c09:Statistics.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Simple demonstration of HashMap.
//<applet code=Statistics width=600 height=400>
//</applet>

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
import com.bruceeckel.swing.*;
import com.bruceeckel.util.*;


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 < 260; i++) {
      Character r = 
        new Character((char)(Math.random() * 26 + 'a'));
      if(hm.containsKey(r))
        ((Counter)hm.get(r)).i++;
      else
        hm.put(r, new Counter());
    }

    for(int i = 0; i < 26; i++) {
      Character r =  new Character((char)(i+'a'));
      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);
}

} ///:~