import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;
public class Main {
public static void main(String[] args) {
Hashtable<String,String> ht = new Hashtable<String,String>();
ht.put("1", "One");
ht.put("2", "Two");
ht.put("3", "Three");
Set st = ht.keySet();
Iterator itr = st.iterator();
while (itr.hasNext()){
System.out.println(itr.next());
}
st.remove("2");
Enumeration e = ht.keys();
while (e.hasMoreElements()){
System.out.println(e.nextElement());
}
}
}
/*
3
2
1
3
1
*/
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