Example - Creating a new world

Say we want to create a new world on our Minecraft server. To do this, we need to know the name of the world, and the type (i.e. overworld, nether or the end). As such, we want to create a command with the following syntax:

/createworld <worldname> <type>

Using the world name and the environment of the world, we can use Bukkit's WorldCreator to create a new world that matches our provided specifications:

new CommandAPICommand("createworld")
    .withArguments(new StringArgument("worldname"))
    .withArguments(new EnvironmentArgument("type"))
    .executes((sender, args) -> {
        String worldName = (String) args[0];
        Environment environment = (Environment) args[1];

        // Create a new world with the specific world name and environment
        Bukkit.getServer().createWorld(new WorldCreator(worldName).environment(environment));
        sender.sendMessage("World created!");
    })
    .register();