Decorator pattern

[Priya Bindra]

I dont understand how decorator pattern is different from sublassing.

Wiki says that: "The decorator pattern is an alternative to subclassing. Subclassing adds behaviour at compile time, and the change affects all instances of the original class; decorating can provide new behaviour at runtime for individual objects."

Can someone explain.

[Siva Masilamani]

This link should help you
webpage

[kri shan]

EJB deployment descriptor adds beans behavior at run-time using decorator design pattern. Inheritance adds behavior during compile time.