Do while loop java char

How to use a while statement with char in java

    private static char getHighLow(Scanner keyboard) 
{
    System.out.println("High, Low, or Sevens (H/L/S): ");
    String choiceString = keyboard.next();

    char choice = choiceString.charAt(0);

    while (choice != 'H' || choice != 'h' || choice != 'L' || choice != 'l' || choice != 'S' || choice != 's')
    {
        System.out.println("You have entered an invalid entry.");
        System.out.println("High, Low, or Sevens (H/L/S): ");
        choiceString = keyboard.next();
    }

    return choice;

}

Source: stackoverflow.com

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