为什么我的 IF-ELSE-IF 语句不能正常工作？

Question

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.

[Redacted]

Any help is appreciated.

Answer 1

If you have defined scnr like this:

Scanner scnr = new Scanner(System.in);

I suggest you do a simple switch case statement with a default clause.

switch (userOpt) {
    case 1:
        // Option 1 logic...
    case 2:
        // Option 2 logic...
    case 3:
        // Option 3 logic...           
    case 4:
        // Option 4 logic...
    default:
        // Handling invalid input...
}

Answer 2

It's really confusing in the way you've written the code. Ie how does case 1 involve get another card? Is all the code written in a main function? How about you make a class called blackjack in which you have different methods for getCard(), holdHand() etc. and make a class variable which holds the hand and also gamecount and wins for dealer/player. Would be much easier to understand your code. Then you can try you code in your main inside the code.

Something like;

public BlackJack { 
**class variables such as hand, player wins etc..**

**methods here**

**main method to try your code**
}

I hope you get what I'm suggesting, I know it might feel like a lot of work to do now when you've written your code but this would help you and anyone who reads your code.