Minecraft Command Argument Int

package fr.titisoli;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

public class Commands implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String msg, String[] args) {
        Player p = (Player)sender;
        if(sender instanceof Player){
            if(cmd.getName().equalsIgnoreCase("slow")){
                if(args.length==0){
                    p.sendMessage("§4/slow <seconds>");
                    return true;
                }else{
                    if(args[0]){

                    }
                }
            }
        }
        return false;
    }

}