Can't get part of my code to run!

Have followed everything and somehow part of my code doesn't run! Have spent ages on this and driving me mad! About ready to give up! Won't run "Dispenser is full" or any of the "Yum" or "Chomp" lines. Please help!

Sorry if I'm being stupid!

EXAMPLE CLASS: /**

• Created by Lawz on 17/03/2017. */ public class Example {

  public static void main(String[] args) { // Your amazing code goes here... System.out.println("We are making a new PEZ Dispenser"); System.out.printf("FUN FACT: There are %d pez in every pez dispenser %n", PezDispenser.MAX_PEZ);

  PezDispenser dispenser = new PezDispenser("Darth Vader");
  
  System.out.printf("The dispensener is %s %n",
          dispenser.getCharacterName());
  
  if (dispenser.isEmpty()) {
      System.out.println("Dispenser is empty");
  }
  
  System.out.println("Filling the dispenser with delicious PEZ...");
  dispenser.fill();
  
  if (!dispenser.isEmpty()) {
      System.out.printf("Dispenser is full");
  }
  while (dispenser.dispense()) {
      System.out.printf("YUM");
  }
  if (dispenser.isEmpty()) {
      System.out.println("You ate all the PEZ!");
  }
  dispenser.fill(4);
  dispenser.fill(2);
  while (dispenser.dispense()) {
  System.out.printf("Chomp chomp!!");
  }
  try {
      dispenser.fill(400);
      System.out.printf("This will never happen");
  } catch (IllegalArgumentException iae) {
      System.out.println("Whoa there!");
      System.out.printf("The error was %s", iae.getMessage());
  }
  

  } }

PEZDISPENSER CLASS: /**

• Created by Lawz on 17/03/2017. */ class PezDispenser { private String characterName; public static final int MAX_PEZ = 12; private int pezCount;

  public PezDispenser(String characterName) { this.characterName = characterName; pezCount = 0; }

  public void fill() { fill(MAX_PEZ); }

  public void fill(int pezAmount) { int newAmount = pezCount + pezAmount; if(newAmount > MAX_PEZ) { throw new IllegalArgumentException("Too many PEZ!!!"); } }

  public boolean dispense() { boolean wasDispensed = false; if(!isEmpty()) { pezCount--; wasDispensed = true; } return wasDispensed; }

  public boolean isEmpty() { return pezCount == 0; }

  public String getCharacterName() { return characterName; } }