public class Person {
   private static final int MAX_PEOPLE_COUNT = 100;
   private String name;
   private int age;
   private static int peopleCount;
   public Person(String name, int age) {
      this.name = name;
      this.age = age; peopleCount++;
   }
   public static int howManyPeople() {
      return peopleCount;
   }
   public boolean maxPeopleCountReached() {
      return peopleCount >= MAX_PEOPLE_COUNT;
   }
}