import java.util.HashMap;
public class Main {
public static void main(String[] args) {
HashMap hMap = new HashMap();
System.out.println("Size of HashMap : " + hMap.size());
hMap.put("1", "One");
hMap.put("2", "Two");
hMap.put("3", "Three");
System.out.println("Size of HashMap after addition : " + hMap.size());
// remove one element from HashMap
System.out.println(hMap.remove("2"));
}
}