Java while循环不重复

Question

I am writing this code where the user puts the username and password then I validate the entries in a database. The problem with my code is that when the input is wrong it does not return and repeat the data input process from the while loop. My code is as below. If someone could help me fix it. Thank you in advance.

boolean b = true;
while (b == true) {
    System.out.println("enter username");
    String username = scanner.next();
    System.out.println("enter password");
    String password= scanner.next();
    boolean result = userDao.validate(username, password);

    if (result == false) {
        System.out.println("password email do not match");
        scanner.next();
    } else {
        System.out.println("success");
        b = false;
    }
}

Answer 1

I don't have enough "reputation points" to provide a comment.. but curious if you would be able to remove scanner.next() within your if statement if that would do the trick.

I tried it by setting the result to false and letting it run.

if (result == false) {
            System.out.println("password email do not match");
            //scanner.next();

        } else {
            System.out.println("success");
            b = false;
        }