What will be the output of the following Java code?

import java.util.*;
class hashtable 
{
    public static void main(String args[]) 
    {
        Hashtable obj = new Hashtable();
        obj.put("A", new Integer(3));
        obj.put("B", new Integer(2));
        obj.put("C", new Integer(8));
        obj.clear();
        System.out.print(obj.size());
    }
}