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CS 210

CS 210. Template Method Pattern October 24 th , 2006. Look at the simple barista example. Eclipse sample code. Abstracted Recipe method. Abstract base class. public abstract class CaffeineBeverage { final void prepareRecipe() { boilWater(); brew(); pourInCup();

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CS 210

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  1. CS 210 Template Method Pattern October 24th, 2006

  2. Look at the simple barista example • Eclipse sample code

  3. Abstracted Recipe method

  4. Abstract base class public abstract class CaffeineBeverage { final void prepareRecipe() { boilWater(); brew(); pourInCup(); addCondiments(); } abstract void brew(); abstract void addCondiments(); void boilWater() { System.out.println("Boiling water"); } void pourInCup() { System.out.println("Pouring into cup"); } }

  5. Coffee and Tea in terms of the abstract caffeine class 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 class Tea extends CaffeineBeverage { public void brew() { System.out.println("Steeping the tea"); } public void addCondiments() { System.out.println("Adding Lemon"); } }

  6. Template Method Pattern defined The Template Method Pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm’s structure.

  7. Caffeine beverage example with hook • Eclipse code

  8. Design Principle The Hollywood Principle Don’t call us, we’ll call you.

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