Alternative to goto statement in Java

Question

OK, so I'm sure this question has been beaten to death, but I still can't find the answer I need for my project.

I am working on building a casino game suite in java (I'm 110% sure that there are better, and easier languages for this, but I am learning java right now and I'd like to code in java for the practice.) My issue is that I cannot figure out how to structure my code. I am used to using goto statements (I started learning coding in small basic). For example:

import java.util.*;

public class CasinoGames
{
  public static void main(String[] args)
  {
    Scanner keys = new Scanner(System.in);
    sopln("Hello, and welcome to Casino Games!");
    sopln("Would you like to login, register, or play as a guest?");
    char token = keys.nextLine().toLowerCase().charAt(0);
    randomlabelhere:
    if (token == "l")
      User.login();
    else if (token == "r")
      User.register();
    else if (token == "g")
      User.guestLogin();
    else
      sopln("Invalid Choice, please try again!");
      goto somerandomlabel

I know this won't compile, so please don't mention that. I know that I can use a do-while loop for this, but if I wanted the option to do a goto, what alternatives do I have?

Answer 1

The closest thing Java has to a goto are labels for break and continue. Goto has been considered harmful for longer than Java has been a language, and consequently Java doesn't have a goto implementation (and goto is a reserved word so you cannot add one). Finally, since token is a char you should compare with char literals like

while(true) {
  if (token == 'l')
    User.login();
  else if (token == 'r')
    User.register();
  else if (token == 'g')
    User.guestLogin();
  else {
    sopln("Invalid Choice, please try again!");
    continue;
  }
  break;
}