Day 4 - Class vs. Instance.java

import java.io.*;
import java.util.*;

public class Person {
    private int age;	
  
	public Person(int initialAge) 
    {
            // Add some more code to run some checks on initialAge
            if (initialAge > 0) 
            {
                age = initialAge;
            } else 
            {
                System.out.println("Age is not valid, setting age to 0.");
                age = 0;
            }
        }

        public void amIOld() 
        {
            // Write code determining if this person's age is old and print the correct statement:
            if (age < 13) System.out.println("You are young.");
            else if (age < 18) System.out.println("You are a teenager.");
            else System.out.println("You are old.");
        }

        public void yearPasses() 
        {
            // Increment this person's age.
            age++;
        }
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for (int i = 0; i < T; i++) {
			int age = sc.nextInt();
			Person p = new Person(age);
			p.amIOld();
			for (int j = 0; j < 3; j++) {
				p.yearPasses();
			}
			p.amIOld();
			System.out.println();
        }
		sc.close();
    }
}