Minecraft Forge 1.8.9 - Need to create custom command arguments

ive been trying to make a custom command on forge 1.8.9, but I couldnt find any guide or ducumentation on how to create argumens for the commands, the thing I want to do is for example "/settext ExampleText", the "ExampleText" should be a String, if anyone knows a solution I would really appreciate it.

I tried searching for documentation, youtube videos but couldnt find anything

Arguments by default (if there are no overloads) - are of string type already.

@Override
public void processCommand(ICommandSender sender, String[] args) {
   if (args.length > 0) {
        sender.addChatMessage(new ChatComponentText("you have set the text: " + text));
   } else {
        sender.addChatMessage(new ChatComponentText("Usage: /settext <text>"));

   }
}

im wrote the code from this template:

public class SimpleCommands extends CommandBase {

    @Override
    public String getCommandName() {
        return "whatsup";
    }

    @Override
    public String getCommandUsage(ICommandSender sender) {
        return "";
    }

    @Override
    public void processCommand(ICommandSender sender, String[] args) throws CommandException {
        // This is where I want it to send something in chat.
    }
    
}