What is the output(TreeMap and ceiling keys)? : Questions « Utility Classes « SCJP

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import java.util.SortedMap;
import java.util.TreeMap;

public class Magellan {
  public static void main(String[] args) {
    TreeMap<String, String> myMap = new TreeMap<String, String>();
    myMap.put("a", "apple");
    myMap.put("d", "date");
    myMap.put("f", "fig");
    myMap.put("p", "pear");
    System.out.println(myMap.higherKey("f"));
    System.out.println(myMap.ceilingKey("f"));
    System.out.println(myMap.floorKey("f"));
    SortedMap<String, String> sub = new TreeMap<String, String>();
    sub = myMap.tailMap("f");
    System.out.println("1st after mango: " + sub.firstKey());
  }
}