Counter.java Source code

Introduction

Here is the source code for Counter.java

Source

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

class Counter {
    int i = 1;

    public String toString() {
        return Integer.toString(i);
    }
}

public class MainClass {
    private static Random rand = new Random();

    public static void main(String[] args) {
        Map hm = new HashMap();
        for (int i = 0; i < 10000; i++) {
            // Produce a number between 0 and 20:
            Integer r = new Integer(rand.nextInt(20));
            if (hm.containsKey(r))
                ((Counter) hm.get(r)).i++;
            else
                hm.put(r, new Counter());
        }
        System.out.println(hm);
    }
}