Decorator Design Pattern

Decorator pattern allows a user to add new functionality to an existing object without altering its structure.

This type of design pattern comes under structural pattern.

This pattern creates a decorator class which wraps the original class and provides additonal functionality keeping class methods signature intact.

Below diagram and code is an example of the Decorator Design Pattern.

原文地址：https://www.cnblogs.com/codingyangmao/p/11252131.html