Template Method Design Pattern

template-method-pattern.java

public abstract class CaffeineBeverage {
  void prepareRecipe() {
    boilWater();
    brew();
    pourInCup();
    if (customerWantsCondiments())
      addCondiments();
  }
  
  abstract void brew();
  abstract void addCondiments();
  void boilWater() {
    System.out.println("Boiling water");
  }
  void pourInCup() {
    System.out.println("Pouring into cup");
  }
  boolean customerWantsCondiments() { // This is a hook because the subclass can override, but doesn't have to
    return true;
  }
}

public class Coffee extends CaffeineBeverage {
  public void brew() {
    System.out.println("Dripping Coffee through filter");
  }
  public void addCondiments() {
    System.out.println("Adding Sugar and Milk");
  }
  public boolean customerWantsCondiments() {
    String answer = getUserInput();
    if (answer.equals("y")) return true;
    else return false;
  }
}