package Tutorial9;
import java.util.NoSuchElementException;
import java.util.LinkedList;
import java.util.Iterator;

public class StudentListTest
{
    public static void main(String args[])
    {
        Student s1 = new Student(20, 99);
        Student s2 = new Student(85);
        Student s3 = new Student(100, 95);
        Student s4 = new Student(98);
        LinkedList s = new LinkedList();
        s.addLast(s1);
        s.addLast(s2);
        s.addLast(s3);
        s.addLast(s4);
        int score = 90;
        int c = StudentListTest.count(s, score);
        System.out.println("Hay " + c + " estudiantes con calificación superior a " + score + ". ");
        
    }
    
    public static int count(LinkedList s, int threshold)
    {
        Iterator it =s.iterator();
        int count=0;
        while (it.hasNext())
        {
            Student stu  = (Student)it.next();
            if (stu.getGrade() >= threshold)
            {
                stu.print();
                count++;
            }
        }
        return count;
    }
}

class Student
{
    private static int nextID = 1;
    private int id;   //En realidad, no necesitamos utilizar el ID para este problema.
    private int grade;
    //private Student next;
    
    public Student( int i, int g)
    {
        id = i;
        grade = g;
        nextID=i+1;
    }
    
    public Student(int g)
    {
        id = nextID;
        grade = g;
        nextID++;
    }
    
    public int getGrade()
    {
        return grade;
    }
    
    public void print()
    {
        System.out.println("ID de estudiante: #"+id+"; Grade : "+grade);
    }
}