Compile-time question

[Barry Burd]

I'm able to compile this simple code ONLY if I comment out the call to p.display(). What am I doing wrong? Thanks.
 
import java.util.ArrayList;
 
class CheckAgeForDiscount {
  ArrayList<Person> people = new ArrayList<Person>();
 
  public static void main(String args[]) {
    new CheckAgeForDiscount();
  }
 
  CheckAgeForDiscount() {
 
    fillArray(people);
      
    people.parallelStream()
      .filter(p -> p.getAge() >= 12)
      .filter(p -> p.getAge() < 65)
      .forEach(p -> {
        p.setPrice(9.25);
      });
    
    people.parallelStream()
      .filter(p -> p.getAge() >= 12)
      .filter(p -> p.getAge() < 65)
      .filter(p -> p.hasCoupon())
      .forEach(p -> {
        p.setPrice(p.getPrice() - 2.00);
      });
 
    people.parallelStream()
      .filter(p -> (p.getAge() < 12 || p.getAge() >= 65))
      .forEach(p -> {
        p.setPrice(5.25);
      });
    
    people.stream()
      .forEach(p -> {
  //      p.display();
      });
    
  }
 
 
 
  private void fillArray(ArrayList<Person> people) {
    people.add(new Person("Barry", 62, true));
    people.add(new Person("Harriet", 66, false));
    people.add(new Person("Jennie", 6, true));
    people.add(new Person("Sam", 8, false));
  }
}
 

public class Person {
  private String name;
  private int age;
  private boolean hasCoupon;
  private double price;
  
  
  
  public double getPrice() {
    return price;
  }
  public void setPrice(double price) {
    this.price = price;
  }
  public Person(String name, int age, boolean hasCoupon) {
    super();
    this.name = name;
    this.age = age;
    this.hasCoupon = hasCoupon;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public boolean hasCoupon() {
    return hasCoupon;
  }
  public void hasCoupon(boolean hasCoupon) {
    this.hasCoupon = hasCoupon;
  }
  
  private void display() {
    System.out.print(getName());
    System.out.print(": Please pay $");
    System.out.print(price);
    System.out.print(". ");
    System.out.println("Enjoy the show!");
  }
}