class User {      
    private String name;
    private int age;
    public User( String str, int yy ) { name = str;  age = yy; } 
    public void print() { 
        System.out.print( "name: " + name + "  age: " + age ); 
    }
}

//StudentUser cannot be extended
final class StudentUser extends User {                            //(A)
    private String schoolEnrolled;
    public StudentUser( String nam, int y, String sch ) {
        super(nam, y);
        schoolEnrolled = sch;
    }
    public void print() {
        super.print();
        System.out.println( "  school: " + schoolEnrolled );
    }
}

//Wrong:
//class UndergradStudentUser extends StudentUser { }              //(B)

class Test {
    public static void main( String[] args ) {
        StudentUser us = new StudentUser( 
                           "Zaphlet", 10, "Cosmology" );
        us.print();
    }
}