Visitor Design Pattern in Java

By | July 8, 2020

In this post, We will talk and learn about the Visitor Design Pattern in Java.

Key Points About Visitor Design Pattern :

  • Visitor Design Pattern falls under behavioral design pattern.
  • This Pattern is mainly used when we have to perform an operation on a group of similar kinds of Objects. This Pattern helps us to move the operational logic from the objects to another class.
  • The main benefit of using this pattern is that if the logic of operation changes then we need to make a change only in the visitor implementation rather than doing modification in all the classes.
  • The second benefit is that adding a new class to the system is easy, it will require change only in visitor interface and implementation and existing classes will not be affected.

Visitor Design Pattern in JDK:

Now Let’s move towards the implementation of the Visitor Design Pattern.

Below is the complete source code:

Visitor Design Pattern

Item.java

 

Book.java

 

Fruit.java

 

ShoppingCartVisitor.java

 

ShoppingCartVisitorImpl.java

 

VisitorTest.java

Output of this client Program:

BooK:Core Java, Book ISBN:8989898, Cost :450.0
BooK:Hibernate, Book ISBN:8980998, Cost :600.0
Fruit :Mango, cost :200.0
Fruit :Apple, cost :600.0
Total Cost ::1850.0

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That’s all about the Visitor Design Pattern in Java.

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