Random Number Minecraft

Im trying to set a random number but excluding a certain number in the random.

public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {


Player player = (Player) sender;

if(commandLabel.equalsIgnoreCase("random")){

    Random random = new Random();

    int randomId = random.nextInt(300);

    if(randomId >= 100 && randomId <= 200){
    player.sendMessage("" + randomId);
    }

    while(randomId != 124){

        randomId = random.nextInt(300);

    }

}

I want to EXCLUDE the number 124 in the random.