Turning information into action with the command pattern
The command pattern is sometimes known as action. The command pattern encapsulates the triggered event as an object that allows the client to act. This pattern was early identified and described in the GoF’s book.
Motivation
The command pattern dictates which instances of the command interface perform which actions on the receiver client. A command object can be parameterized to define an action in greater detail. The commands can include a callback function to notify others of the occurrence of an event. Sometimes, commands can be thought of as object-oriented replacements for callback functions. A newly created command object can have different dynamics depending on the event that initiated it. The client can react to it according to an already scheduled scenario.
Finding it in the JDK
Nice examples are provided in the JDK by the Callable and Runnable interfaces from the java.base module and the java.util...
