Head-First-Design-Patterns | Code for Head First Design Patterns book
kandi X-RAY | Head-First-Design-Patterns Summary
kandi X-RAY | Head-First-Design-Patterns Summary
I have recently updated all the code for Head First Design Patterns for the 2nd edition of the book, released in December, 2020. Download the code and compile and run from the command line, or load the code into project in Eclipse using Java 8 or higher. Other links for the book are available on the book page at wickedlysmart.com.
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Top functions reviewed by kandi - BETA
- Returns a string representation of this recipe
- Returns a string representation of this filter
- Convert the ingredients to a string
- Returns a string representation of this offer
- Main method for testing
- Creates a String representation of the model
- Returns a String representation of the model
- Returns a string representation of this state
- Starts the remote control
- Main method
- Creates and returns a new pizza with the given name
- Create a new pizza with the given parameters
- Main method for testing purposes
- Prints the recipes
- Creates a new Pie identifier
- Convenience function to create and return a person or null
- Main method for testing
- Main method for testing
- Handle the request
- Utility for testing
- Builds a house builder
- Adds walls to the house
- Paint the album image
- Create the controls
- The main loop method
- Simple test
- Main method that is used to create a pie sausage
- Creates a new pizza
- Create the view
- Load a movie
- Main application application
Head-First-Design-Patterns Key Features
Head-First-Design-Patterns Examples and Code Snippets
Community Discussions
Trending Discussions on Head-First-Design-Patterns
QUESTION
In the Head First Design Patterns book, the authors describe using an iterator to traverse over composite data structures. They provide some sample code which, when executed, prints out a series of menu items stored within the composite. However, if you try to call the iterator more than once, it no longer works as expected and won't produce any results. The following code appears to be causing the problem:
...ANSWER
Answered 2021-Mar-18 at 13:51As the linked issue says in the comments:
QUESTION
I am from C++ background, recently started learning Design Patterns.
I am facing problems with this code from Head First Design Patterns:
Link: PizzaStore.java
...ANSWER
Answered 2017-Nov-28 at 15:19PizzaStore class already contains a SimplePizzaFactory object
Well, PizzaStore have a non-initialized attribute of type SimplePizzaFactory. In the PizzaStore constructor, that attribute is initialized with a reference to the constructor argument. This is an usual pattern in Java code.
The passed-on object is not initialized with any data (which needs to be copied by PizzaStore Constructor)
There is no need to add initialization code in the constructor, is asumed that the SimplePizzaFactory is already initialized. That factory is not copied, is referenced by the PizzaStore attribute, so the factory inside the PizzaStore, after the constructor is executed, is an already initialized object.
QUESTION
How the Rx Subject and the Subject in GandOfFour Observer pattern are different?
...ANSWER
Answered 2017-Apr-13 at 17:25There's some overlap:
GoF Subject: Subscribe handler, unsubscribe handler, send notification to handlers
Rx Observable: Subscribe handler of type T, (implicitly unsubscribe via subscription disposable)
- Rx Observer: Handler that receives notification of type T (or error, or end)
- Rx Subject: Observable + Observer for some type T
So they support the same basic operations. I would assume Rx Team chose their name based on GoF usage. Rx Team though clearly wanted to split the functions of 'Subject' into sender and receiver: The emphasis in Rx is observables, not subjects.
QUESTION
I'm reading Head First Design Patterns and I'm trying to replicate the Design Patterns in a Swift Playground. I'm trying to get the Observer pattern working as per the book. My current source is as follows:
...ANSWER
Answered 2017-Feb-01 at 01:27Arbitrary objects are can not be tested for equality. There are many kinds of objects which full equality is difficult or even impossible to determine in Swift (and generally speaking in most popular languages; Swift just addresses this problem more explicitly than many other languages do). There are lots of ways to address this, but in your case you really likely mean that the observer is some specific instance of a class, a reference type, rather than a value. The number 4 is probably not allowed to be an observer, for instance. That's something that can happen in Swift, so you need to tell Swift that it isn't legal here because 4 is a value, not a reference.
OK, enough background. How do you do it? Well, first, say Observers have to be classes (i.e. reference types).
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install Head-First-Design-Patterns
You can use Head-First-Design-Patterns like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Head-First-Design-Patterns component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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