4. Arguments

Arguments are the essentials to building a command's structure. Below is a command with 4 Arguments, all of them required:

public class BasicCommand extends Command<World, Object>
{

	public SpawnEntityCommand()
	{
		this.setName("spawn");

		this.addArgument(new RequiredArgument("entityName", ParamType.STRING));
		this.addArgument(new RequiredArgument("posX", ParamType.INT));
		this.addArgument(new RequiredArgument("posY", ParamType.INT));
		this.addArgument(new RequiredArgument("posZ", ParamType.INT));
	}

	@Override
	public Object onExecute(World world, Arguments args)
	{
		String entityName = args.getString();
		int posX = args.getInt();
		int posY = args.getInt();
		int posZ = args.getInt();

                world.spawnEntity(entityName, posX, posY, posZ);

                return obj;
	}
}

This command spawns an entity upon execution. It expects the user to put the entity's name, and 3 positions that represent the 3 axises x, y, and z.

Tip: There is no limit to the amount of arguments that a command can take. However, it is recommended to keep your arguments to a minimum. Not due to performance issues, but long command chains are bad designs.