Java：將用戶輸入添加到 while 循環

Question

我試圖在 PlayerOne class 中放置一個 while 循環，用戶可以在其中選擇玩家的職業。 我不知道如何讓它工作。 你能給我一個建議或提示嗎？ 謝謝，（我想您不需要 Player class 或 Main 類，所以我將它們放在一邊）

Scanner scanner = new Scanner(System.in);
while (true) {
         System.out.println("Choose your profession: \n" +
        "Press 1 for a knight class\n" +
        "Press 2 for a rider class\n" +
        "Press 3 for a mage class");
    int choice = scanner.nextInt();
    scanner.nextLine();
    switch (choice) {
        case 0:
            // here I want to put an option to choose a knight by pressing number 1
            break;
        case 1:
            // an option to choose a rider by pressing number 2
            break;
case 1:
            // an option to choose a mage by pressing number 3
            break;

Answer 1

我認為當有人選擇有效職業時，您需要一個停止條件，如下所示：

Scanner scanner = new Scanner(System.in);
String profession = null;
while (profession == null) {
    System.out.println("Choose your profession: \n" +
        "Press 1 for a knight class\n" +
        "Press 2 for a rider class\n" +
        "Press 3 for a mage class");
    int choice = scanner.nextInt();
    scanner.nextLine();
    switch (choice) {
        case 1:
            profession = "knight";
            break;
        case 2:
            profession = "rider";
            break;
        case 3:
            profession = "mage";
            break;
        default:
            System.out.println("Invalid option");
            profession = null;
            break;
    }
}
System.out.println("You selected: "+profession+" class.");

Answer 2

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String profession= null;
    while (profession == null) {
        System.out.println("Choose your profession: \n" +
                "Press 1 for a knight class\n" +
                "Press 2 for a rider class\n" +
                "Press 3 for a mage class");
        String choice = scanner.nextLine();

        if (choice.equals("1")){
            profession = "knight";
            System.out.println("You selected: "+profession+" class.");
        }else if (choice.equals("2")){
            profession = "rider";
            System.out.println("You selected: "+profession+" class.");
        }else if (choice.equals("3")){
            profession = "mage";
            System.out.println("You selected: "+profession+" class.");
        }else {
            System.out.println("invaild option");
        }
    }
    
}