Day 4 Instance.java

import java.util.Scanner;

public class Solution {
    static 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();
    }
}