/* package whatever; // don't place package name! */
import java.util.concurrent.ConcurrentHashMap;
import java.util.Iterator;
 
 
class Ideone
{
 
 
    public static void main(String[] args)
    {
        ConcurrentHashMap<String,String> premiumPhone = new ConcurrentHashMap<String,String>();
        premiumPhone.put("Apple", "iPhone6");
        premiumPhone.put("HTC", "HTC one");
        premiumPhone.put("Samsung","S6");
 
        Iterator iterator = premiumPhone.keySet().iterator();
 
        while (iterator.hasNext())
        {
            System.out.println(premiumPhone.get(iterator.next()));
            premiumPhone.put("Sony", "Xperia Z");
            System.out.println(premiumPhone.size());
        }
 
    }
 
}

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