About Pankaj Kumar
Visitor Pattern is one of the behavioral design pattern. Visitor pattern is used when we have to perform an operation on a group of similar kind of Objects. With the help of visitor pattern, we can move the operational logic from the objects to another class.
For example, think of a Shopping cart where we can add different type of items (Elements), when we click on checkout button, it calculates the total amount to be paid. Now we can have the calculation logic in item classes or we can move out this logic to another class using visitor pattern. Let’s implement this in our example of visitor pattern.
To implement visitor pattern, first of all we will create different type of items (Elements) to be used in shopping cart.
ItemElement.java
package com.journaldev.design.visitor;public interface ItemElement { public int accept(ShoppingCartVisitor visitor);} Source : http://www.javacodegeeks.com/2013/08/visitor-design-pattern-in-java-example-tutorial.html
