//: c11:Statistics.java
// Simple demonstration of HashMap
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 200
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Simple demonstration of HashMap.
import java.util.*;

class Counter { 
  int i = 1; 
  public String toString() { 
    return Integer.toString(i); 
  }
}

public class Statistics {
  public static void main(String[] args) {
    HashMap hm = new HashMap();
    for(int i = 0; i < 1000; i++) {
      // Produce a number between 0 and 10:
      Integer r = 
        new Integer((int)(Math.random() * 10));
      if(hm.containsKey(r))
        ((Counter)hm.get(r)).i++;
      else
        hm.put(r, new Counter());
    }
    System.out.println(hm);
    for(int i = 0; i < 10; i++) {
      Integer r =  new Integer((int)(i));
      if(hm.containsKey(r)){
         Counter c = (Counter)hm.get(r);
          System.out.println (r + " -> " + c + "\n");
      }
    }
  }
} ///: