Hacker Rank - Day 4 : Class vs. Instance

                        Day 4 :Class vs. Instance

Solution In Java 8:

import java.io.*;
import java.util.*;
public class Person {
    private int age; 

    public Person(int initialAge) {
          this.age = initialAge;
        if(age<0)
        {
            age = 0;
            System.out.println("Age is not valid, setting age to 0.");
        }
    }

    public void amIOld() {
        String str = "";
        if(age < 13)
        {
            str = "You are young."; 
        }
        else if(age >= 13 && age < 18)
        {
            str = "You are a teenager."; 
        }
        else
        {
            str = "You are old."; 
        }
        System.out.println(str);
    }

    public void yearPasses() {
          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();
    }
}
Solution In Python 3: 

class Person:
    def __init__(self, initialAge):
        if initialAge > 0:
            self.age = initialAge
        else:
            print("Age is not valid, setting age to 0.")
            self.age = 0
    def amIOld(self):
        if self.age < 13:
            print("You are young.")
        elif self.age < 18:
            print("You are a teenager.")
        else:
        print("You are old.")
    def yearPasses(self):
            self.age += 1

t = int(input())
for i in range(0, t):
    age = int(input())        
    p = Person(age) 
    p.amIOld()
    for j in range(0, 3):
        p.yearPasses()      
    p.amIOld()
    print("")