Listing 4: PollsDemo.java
import java.util.*;
public class PollsDemo {
public static void seeElements(NavigableSet NS,String info)
{
//see the elements
System.out.println(info);
Iterator i=NS.iterator();
while(i.hasNext()){
System.out.println(i.next());
}
}
public static void main(String args[]) {
//create a SortedSet -> tree structure
SortedSet SS=new TreeSet();
//create a NavigableSet
NavigableSet NS=(NavigableSet)(SS);
//populate the NS
NS.add("Hydro");
NS.add("George");
NS.add("Any");
NS.add("Martin");
NS.add("Wallace");
String first=(String)NS.first();
String last=(String)NS.last();
seeElements(NS,"Test first/last methods from SortedSet:");
System.out.println("---The first method returns:"+first+"---");
System.out.println("---The last method returns:"+last+"---");
System.out.println("----------------------------------------");
String pollfirst=(String)NS.pollFirst();
String polllast=(String)NS.pollLast();
seeElements(NS,"Test pollFirst/pollLast methods from NavigableSet:");
System.out.println("---The pollFirst method returns:"+pollfirst+"---");
System.out.println("---The pollLast method returns:"+polllast+"---");
System.out.println("----------------------------------------");
}
}
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