Solved Deop a player from the server?

So I'm making this plugin where if a player has a certain permission, they are automatically deopped upon being opped.

Code:

package me.thecerealkill3r.suspend;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerLoginEvent;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener {
public void onEnable(){

    Bukkit.getServer().getPluginManager().registerEvents(this, this);
}
    public boolean onCommand(CommandSender sender, Command cmd, String lbl, String[] args){
        if ((sender instanceof Player));
        Player player = (Player)sender;
        Bukkit.getServer().getOnlinePlayers();
    
            if(player.hasPermission("player.is_suspended")){
                if(player.isOp()){
                    /*/ Player becomes deopped here /*/
                }
            }
    
        return false;
    }
}

EDIT:

Would this be good?

Code:

package me.thecerealkill3r.suspend;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerLoginEvent;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener {
public void onEnable(){
 
    Bukkit.getServer().getPluginManager().registerEvents(this, this);
}
    public boolean onCommand(CommandSender sender, Command cmd, String lbl, String[] args){
        if ((sender instanceof Player));
        Player player = (Player)sender;
        Bukkit.getServer().getOnlinePlayers();
     
            if(player.hasPermission("player.is_suspended")){
                if(player.isOp()){
                    Bukkit.getServer().dispatchCommand(Bukkit.getServer().getConsoleSender(), "deop " + player);
                }
            }
     
        return false;
    }
}

 

Use .setOp()

 

Few errors;
- You would need to use player.getName() for the dispatch command.
- Also whats the point in your line "Bukkit.getServer().getOnlinePlayers();"? If your trying to get all the online players you would want to use a for loop, like;
For(Player online : Bukkit.getOnlinePlayers()) {
- also when your checking if the sender is an instanceof a player, you need a { at the end, not ; . All if statements you need those!

 

@VG.Developments I know about all of those, I leave the ugfixing to the end.

 

Well thats how you fix your code like you asked so i answered the question

 

@MrBlackIsBack i didn't think it would be that easy. -_-
thanks!