Example - Show particles at a player's location

Say we wanted to have a command that displayed particles at a player's location. We will use the following command structure:

/showparticle <particle>

With this, we can simply spawn the particle using the World.spawnParticle(Particle, Location, int) method:

new CommandAPICommand("showparticle")
    .withArguments(new ParticleArgument("particle"))
    .executesPlayer((player, args) -> {
        player.getWorld().spawnParticle((Particle) args[0], player.getLocation(), 1);
    })
    .register();