iterates over the components

displays the composite details and iterate over the components

has next

displays the item

Encapsulation

Irritation

Single creation

Abstraction

Sub class

Interface

Inheritance

Abstract

To avoid the need to create a new class for each product

You are decoupling the implementation of the product from its use

You are are allowing multiple creators

You are coupling the implementation of the product with its use

Define as Strings

Compile the code

Use static constants or enum

Add exception handling