import java.util.*;

public class TreeMapMain
{
	public static void main (String[ ] args) 
    	{
       		TreeMap<String,Double> students = new TreeMap<String,Double>();

       		students.put ("Bogan, James", 3.85);
       		students.put ("Zawada, Matt", 3.95);
       		students.put ("Balan, Tavi", 4.00);
       		students.put ("Nikolic, Lazar", 3.85);

       		System.out.println (students);

		for (Map.Entry<String, Double> entry : students.entrySet())
			if (entry.getValue() > 3.9)
			       System.out.println (entry.getKey() + " " + entry.getValue());

       		System.out.println (students.remove ("Brown, Robert"));
       		System.out.println (students.remove ("Zawada, Matt"));
		System.out.println (students.containsKey ("Tavi Balan"));
       		System.out.println (students.containsKey ("Balan, Tavi"));
       		System.out.println (students.containsValue (3.85));
    	} // method main

} // class TreeMapMain