Its easy to maintain and extend when the number of choices are more. : For this scenario, we'll follow the original Gang of Four design and naming conventions. The Decorator Pattern is also known as Wrapper. In this article we will explore and learn Decorator Design pattern in Java which is a prominent core Java design pattern and you can see lot of its example in JDK itself. This tutorial demonstrates how to implement the decorator design pattern in Java through an example using the Shape class, adding behaviors to an object. Suppose we have a Christmas tree object and we want to decorate it.
The disadvantage of decorator design pattern is that it uses a lot of similar kind of objects (decorators). The programming world has encountered a large number of problems, and a variety of solution have been proposed to tackle them. In other words, The Decorator Pattern uses composition instead of inheritance to extend the functionality of an object at runtime. First, we'll create a ChristmasTree interface and its implementation: The implementation of this interface will look like: We'll now cr… The decoration does not change the object itself; it’s just that in addition to the Christmas tree, we're adding some decoration items like garland, tinsel, tree-topper, bubble lights, etc. Decorator Design Pattern – Important Points. An attempt was made by a group of four people, famously called the “Gang-Of-Four” or GoF, to come up with a set of common problems and solutions for them, in the given context. Example of Decorator DP A Decorator Pattern says that just "attach a flexible additional responsibilities to an object dynamically". We have been building object-oriented software for over 40 years now, starting with Smalltalk, which was the first object-oriented language. Decorator design pattern is helpful in providing runtime modification abilities and hence more flexible.
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