import java.util.*;

public class StudentMap
{
	public static void main (String[ ] args) 
	{
	        Map<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);

        	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));
         
        	System.out.println (students);
	} // method main

} // StudentMap