In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.
Behavioral patterns are concerned with the assignment of responsibilities between objects, or, encapsulating behavior in an object and delegating requests to it.
Unlike the Creational and Structural patterns, which deal with the instantiation process and the blueprint of objects and classes, the central idea here is to concentrate on the way objects are interconnected. In a word, we can say this: If Creational is about instantiation, and Structural is the blueprint, then Behavioral is the pattern of the relationship among objects.
The state pattern is a behavioral design pattern. According to GoF definition, a state allows an object to alter its behavior when its internal state changes. The object will appear to change its class. It can be drawn from above definition that there shall be a separate concrete class per possible state of an object. …
Mediator helps in establishing loosely coupled communication between objects and helps in reducing the direct references to each other.
According to the GoF definition, the observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. It is also referred to as the publish-subscribe pattern. In the observer pattern, many observers (subscriber objects) observe a particular subject …
Memento design pattern is behavioral pattern and one of 23 design patterns discussed by Gang of Four. Memento pattern is used to restore state of an object to a previous state. It is also known as snapshot pattern. A memento is is like a restore point during the life cycle …
An iterator design pattern provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation.
Command pattern is a behavioral design pattern which is useful to abstract business logic into discrete actions i.e. commands. It motivates loose coupling.
Strategy design pattern is behavioral design pattern where we choose a specific implementation of algorithm or task in run time – out of multiple other implementations for same task.
Template method design pattern is widely accepted behavioral design pattern to enforce some sort of algorithm (fixed set of steps) in the context of programming. It defines the sequential steps to execute a multi-step algorithm and optionally can provide a default implementation as well (based on requirements). Table of Contents …
Design patterns are used to solve the problems which occur in a pattern, we all know that, right? Also we know that behavioral design patterns are design patterns that identify common communication patterns between objects. One of such behavioral patterns is visitor pattern, which we are going to learn about …
The Chain of Responsibility is known as a behavioral pattern. The main objective of this pattern is that it avoids coupling the sender of the request to the receiver, giving more than one object the opportunity to handle the request. The core logic defined by GoF is : “Gives more …
HowToDoInJava provides tutorials and how-to guides on Java and related technologies.
It also shares the best practices, algorithms & solutions and frequently asked interview questions.