Why won't my IF-ELSE-IF statement work correctly?

I am trying to create a simple Blackjack game in Java. I have a menu with possible integer options from 1-4. If the user inputs an integer greater than 4, my IF statement needs to print "invalid integer" and then restart the game. If the user inputs a negative value, my ELSE-IF statement needs to do the same thing.

However, the statements will only work once, so I can't get "invalid integer" to print if I input values below 0 and values greater than 4 multiple times/back-to-back.

Code:

System.out.print("1. Get another card\n" +
        "2. Hold hand\n" +
        "3. Print statistics\n" +
        "4. Exit\n" + "Choose an option: ");
userOpt = scnr.nextInt();

if (userOpt > 0) {
    switch (userOpt) {
        case 1:
            if (playerHand == 21) {
                System.out.println("BLACKJACK! You win!");
                playerWins++;
                gameCounter++;
                System.out.println("START GAME #" + gameCounter);
                playerHand = 0;
            } else if (playerHand > 21) {
                System.out.println("You exceeded 21! You lose!");
                dealerWins++;
                gameCounter++;
                System.out.println("START GAME #" + gameCounter);
                playerHand = 0;
            }
            break;
        case 2:
            dealer = generatedNumber.nextInt(11) + 16;
            if (dealer > 21) {
                System.out.println("You win!");
                playerWins++;
                gameCounter++;
                System.out.println("START GAME #" + gameCounter);
                playerHand = 0;
            } else if (dealer == playerHand) {
                System.out.println("It's a tie! No one wins!");
                tieGames++;
                gameCounter++;
                System.out.println("START GAME #" + gameCounter);
                playerHand = 0;
            } else {
                System.out.println("Dealer wins!");
                dealerWins++;
                gameCounter++;
                System.out.println("START GAME #" + gameCounter);
                playerHand = 0;
            }
            break;
        case 3:
            System.out.println("Number of Player wins: " + playerWins);
            System.out.println("Number of Dealer wins: " + dealerWins);
            System.out.println("Number of tie games: " + tieGames);
            System.out.println("Total # of games played is: " + gameCounter);

            double playerwinsNew = playerWins;
            percentage = (((playerwinsNew * 100)) / (gameCounter));
            System.out.println("Percentage of Player wins: " + percentage + "%");
        case 4:
            break;
        default:
            System.out.println("Invalid input!\n" + "Please enter an integer value between 1 and 4.");
            System.out.print("1. Get another card\n" +
                    "2. Hold hand\n" +
                    "3. Print statistics\n" +
                    "4. Exit\n" + "Choose an option: ");
            userOpt = scnr.nextInt();
            continue;
    }
} else if (userOpt < 0) {
    System.out.println("Invalid input!\n" + "Please enter an integer value between 1 and 4.");
    System.out.print("1. Get another card\n" +
            "2. Hold hand\n" +
            "3. Print statistics\n" +
            "4. Exit\n" + "Choose an option: ");
    userOpt = scnr.nextInt();
    continue;
}

Any help is appreciated.