// file TestPerson.java

public class TestPerson
{  public static void main(String[] args)
   {
      Person p1 = new Person("John", 21);
      System.out.println("p1's name is: " + p1.getName());
      System.out.println("p1's age is: " + p1.getAge());
      p1.incrementAge();
      System.out.println("p1's age is: " + p1.getAge());
      p1.setAge(18);
      System.out.println("p1's age is: " + p1.getAge());
    }
}