05 - Day 4 - Class vs. Instance.java

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

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

    public void amIOld() {
        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() {
        age++;
    }

	public static void main(String[] args) {