class student
{
    protected String name;
    protected double gpa;
    protected int year;
    // boring info skipped..
    protected static int tuition; // same for all students

    public student(String n) // constructor
    {
	name = n;
	year = (int)(Math.random()*5);
	gpa = ((int)(Math.random()*401))/100.0;
    }
    // no destructors needed
    // can have alternate constructors

    // accessor:
    public String name() { return name; } // can overload "name"

    public void setyear(int y)
    {
	if (y>=0 && y<4) year = y;
	else throw new RuntimeException("invalid year value");
    }

    // instead of print, override tostring function of superclass Object,
    // keyword "virtual" not needed
    public String toString()
    {
        String[] Y = {"freshman","sophomore","junior","senior","grad student"};
	return name+" is a " + Y[this.year] +" with a GPA of "+gpa;
    }
}//student class


public class first17  // main must be in public class
{
    static void f(student s) // is s a pointer?
    { s.setyear(3); }

    public static void main(String[] argv)  // what does static mean?
    {
        student s2 = new student("Ed");
        s2.setyear(1);
        System.out.println(s2.toString());
        f(s2); 
	System.out.println(s2);  // automatically calls .toString on s2

	String[] Roster = {"Allen","Alex","Fred"};
	student[] Students = new student[ Roster.length ];
	for(int i=0;i<Roster.length;i++)
	    Students[i] = new student(Roster[i]);
	for(student s:Students) System.out.println(s);
    }
}