First of all add this add the very top of the method.
now add thisCode:String[] cmd = playerCommand.split(" "); cmd[0] = cmd[0].toLowerCase();
Code:else if (cmd[0].equals("mute")) { if(cmd.length == 2) { Connection.addNameToMuteList(cmd[1]); for(Player p : Server.playerHandler.players) { if(p.playerName.equals(cmd[1])) { Client c = (Client) p; c.sendMessage("Your have been muted by: "+playerName); } } } }