DevJanis

    //coding by DevJanis
    String prefix = "§6[§a§lServer§6] ";
    @Override
public boolean onCommand(CommandSender sender, Command cmd, String string, String[] args) {
    if(cmd.getName().equalsIgnoreCase("ping"));


//player
Player p = (Player) sender;
//args length
if(args.length == 0) {
    //player message
    p.sendMessage(prefix + " §6§b§lDein derzeitiger Ping lautet §6§l" + getPing(p) + "§b§l ms");
}

return false;
}

public double getPing(Player p) {
CraftPlayer pingc = (CraftPlayer) p;
EntityPlayer pinge = pingc.getHandle();
return pinge.ping;
}
}