Welcome to Episode Four of our Minecraft plugin development series.
Click here to see the third episode where I show you how to listen for any game events (actions) when making Minecraft plugins.
In this episode, we’re going to cover:
- Commands — Making a custom command with CommandExecutor interface.
- Registering commands — Using plugin.yml and the getCommand() method to register a command.
- Tab completion — Making commands tab complete.
- All Bukkit commands — You can see a list of all Bukkit commands here: https://bukkit.fandom.com/wiki/CraftBukkit_Commands
- Plugin.yml tutorial — Everything you can put inside plugin.yml including how to register commands there you can find at: https://docs.papermc.io/paper/dev/plugin-yml
Registering Command In Plugin.Yml
Before creating any command, you need to register it in plugin.yml file so that the server can recognize it. See the above video for more instructions or the link to plugin.yml tutorial for all available options.
Here is an example of the /cow command which can also be run with the /cowcannon alias:
Implementing Your Command
Then create a new class and make it implement CommandExecutor. Inside that, implement the required onCommand() method taking the following parameters:
The method returns true or false. Return true if the command was run properly, otherwise return false so that the server can display the “usage” message from your plugin.yml, if specified.
Then implement your code. You will see an example of this in the video above. The most important part is the args parameter, which splits everything following the command label (/cow). Such as /cow hello world will give you “hello” as args and “world” as args, and args.length will return 2 because there are two arguments.
Adding Tab Completion
You can optionally implement the TabExecutor for the command and implement the onTabComplete() method. Return “null” in the method for the server to suggest all online player names. If you want to disable tab completion, return a new empty array list. You can create a switch statement or if-conditions depending on the args length to tab complete different parts of the command.
Registering Command Executor
Finally, don’t forget to get the command from the server and set its executor to your own class.
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