public class Person {
  private int age;
  public Person(int age) {
    this.age = age;
  }
  public void happyBirthday() {
    age++;
  }
  public int getAge() {
    return age;
  }
  public static void main(String args[]) {
    Person p1 = new Person(27);
    Person p2 = new Person(25);
    p1.happyBirthday();
    System.out.println(p1.getAge());
    System.out.println(p2.getAge());
  }
}