public class Student {
private String Last_Name;
private String First_Name;
private int Grade_Level, ID;
private double GPA;

public Student() {
    Last_Name = "None";
    First_Name = "None";
    Grade_Level = 0;
    GPA = 0.0;
}

public Student(String firstName, String lastName, int gradeLevel, double gpa) {
    Last_Name = lastName;
    First_Name = firstName;
    Grade_Level = gradeLevel;
    GPA = gpa;
}

public String toString(){
    return Last_Name + ", " + First_Name + "nGPA: " + GPA + "nGrade Level: " + Grade_Level + " id # " + ID++;
}