java - 尝试重复直到条件为假

Question

我正在尝试制作一个循环，重复直到用户输入正确的信息(没有空格或空白)。这是我到目前为止所拥有的，但它只重复一次。我希望它重复直到用户填写正确的名称，例如奥斯卡/奥斯卡/奥斯卡

    System.out.print("Name: ");
    String name = scanner.nextLine();
    name = name == null ? "" : name.trim();
    while(name.isEmpty()) {
        System.out.println("Wrong data");
        System.out.print("Name: ");
        String name1 = scanner.nextLine();
        name = name1;
    }

Answer 1

您需要使用 do/while 循环，这样您就不会将相同的代码写两次:

Scanner scanner = new Scanner(System.in);

String name = null;
do { //use do while loop for this
    if (name != null)
        System.out.println("Invalid Name \"" + name + "\" Try again");

    System.out.print("Enter Your Name: ");
    name = scanner.nextLine();

    //keep looping until name is only letters
} while (!name.matches("[A-Za-z]+"));

System.out.println("Welcome " + name);

输出:

Enter Your Name:
Invalid Name "" Try again
Enter Your Name: a1
Invalid Name "a1" Try again
Enter Your Name: 1
Invalid Name "1" Try again
Enter Your Name: Oskar
Welcome Oskar