Decorator pattern java

The Decorator pattern is best when the decorators modify the behavior of the methods in the interface . A decorator can add methods, but added methods don’t carry through when you wrap in another decorator.

Decorator patterns allow a user to add new functionality to an existing object without altering its structure . So, there is no change to the original class. The decorator design pattern is a structural pattern, which provides a wrapper to the existing class.28 Eki 2021

2. Decorator Pattern Example. Note that in the first tree1 object, we’re only decorating it with only one Garland, while the other tree2 object we’re decorating with one BubbleLights and two Garlands . This pattern gives us this flexibility to add as many decorators as we want at runtime.

Decorator is a structural design pattern that lets you attach new behaviors to objects by placing these objects inside special wrapper objects that contain the behaviors.