Person.java

class Person {
  private int age;
  
  public int getAge() {
    return this.age;
  }
  
  public void setAge(int age) {
    if (age < 0 || age > 200) {
      throw new IllegalArgumentException("Invalid age");
    }
    
    this.age = age;
  } 
}

public class HelloWorld{

     public static void main(String []args){
        Person p = new Person();
        p.setAge(-10);
     }
}