Student

package org.example;

public class Student extends Person{
    private int year_stud;

    public Student(String name, int age, int year_stud){
        super(name, age);

        if (year_stud < 0)
            throw new IllegalArgumentException("Amount of studying years must be >= 1");

        this.year_stud = year_stud;
    }

    public int getYear_stud(){
        return year_stud;
    }

    public void setYear_stud(int year_stud){
        if (year_stud < 0)
            throw new IllegalArgumentException("Amount of studying years must be >= 1");

        this.year_stud = year_stud;
    }

    public String toString(){
        return "Student { " + name + " who is " + age + ", studies already: " + year_stud + " years }";
    }
}