Decorator Pattern Java
In other words the decorator pattern uses composition instead of inheritance to extend the functionality of an object at runtime.
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Decorator pattern java. This pattern creates a decorator class which wraps the original class and. The decorator design pattern is a structural pattern which provides a wrapper to the existing class. Decorator design pattern uses abstract classes or interfaces with the composition to implement.
The decorator pattern is also known as wrapper. Decorator pattern is used a lot in java io classes such as. A decorator pattern can be used to attach additional responsibilities to an object either statically or dynamically.
A decorator pattern says that just attach a flexible additional responsibilities to an object dynamically. Its easy to maintain and extend when the number of choices are more. In the implementation of this pattern we prefer composition over an inheritance so that we can reduce the overhead of subclassing again and again for each decorating element.
This type of design pattern comes under structural pattern as this pattern acts as a wrapper to existing class. This wrapping could be achieved by the following sequence of steps. Decorator pattern allows a user to add new functionality to an existing object without altering its structure.
Decorator design pattern is helpful in providing runtime modification abilities and hence more flexible. The decorator pattern can be used to extend decorate the functionality of a certain object statically or in some cases at run time independently of other instances of the same class provided some groundwork is done at design timethis is achieved by designing a new decorator class that wraps the original class.
