import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
public class ClassRoll
{
	private ArrayList<Student> roll;
	
	public ClassRoll()
	{
		this.roll = new ArrayList<Student>();
	}
	
	public void addToRoll(Student aStudent)
	{
		this.roll.add(aStudent);
	}
	
	public Student getStudent(String name)
	{
		for (Student s : roll)
			if ( s.getName().equals(name) )
				return s;
		return null;
	}
	
	public double getAverage(String name)
	{
		for (Student s : roll)
			if ( s.getName().equals(name) )
				return s.getAverage();
		return 0.0;
	}
	
	public String toString()
	{
		/*
		Object[] list = roll.toArray();
		Arrays.sort( list );
		
		String image = "";
		for (Object element : list)
			image += "\n" + (Student)element;
		return image;
		*/
		
		String image = "";
		for (Student element : this.roll)
			image += "\n" + element;
		return image;
	}
	
}