October 2018
Intermediate to advanced
370 pages
9h 15m
English
Content preview from Hands-On Object-Oriented Programming with Kotlin
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Command
The command pattern is used to encapsulate required information in order to perform an action or start a process. The data is therefore put into an object that is passed to an executor. It's worth mentioning that execution of commands can also be delayed if this is necessary. The following diagram shows how this pattern can be implemented:
The preceding diagram contains the UserCommand interface, which is implemented by the CreateUserCommand and DeleteUserCommand classes. A constructor of UserCommand takes an instance of the User class and a certain implementation of the UserCommand interface, then encapsulates an operation with ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.