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/*
Output:
Virginia, New York, Massachusetts
* */
import java.util.TreeMap;
public class MainClass {
public static void main(String args[]) {
TreeMap map = new TreeMap();
map.put("Virginia", "Richmond");
map.put("Massachusetts", "Boston");
map.put("New York", "Albany");
map.put("Maryland", "Annapolis");
if (!map.isEmpty()) {
Object last = map.lastKey();
boolean first = true;
do {
if (!first) {
System.out.print(", ");
}
System.out.print(last);
last = map.headMap(last).lastKey();
first = false;
} while (last != map.firstKey());
System.out.println();
}
}
}
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