关于字符串检查的 if 语句无法访问代码

Question

由于某种原因，我收到一条错误消息，指出该线路currentUser = gar.getAccount(userN);无法访问，但实际上不应该如此。Garage.getAccount()只是从 a 检索Hashmap。两个 if 语句并不相互矛盾，我尝试添加 else 语句，但无论它说什么，该行都是无法访问的。package main;import java.util.Scanner;public class Main {    private static Scanner input;    private static Garage gar;    private static Attendant currentUser;    private static boolean isManager;    public static void main(String[] args) {        input = new Scanner(System.in);        gar = new Garage(10, 80, 10);        currentUser = null;        while (currentUser == null)            logIn();    }    public static void logIn() {        System.out.println("Enter username: ");        String userN = input.nextLine();        System.out.println("Enter password:");        String userP = input.nextLine();        //if no username, go back        if(gar.getAccount(userN) == null) {             error("Incorrect username");            return;        }         if(gar.getAccount(userN).getPassword().equals(userP) == false); { //if entered password doesn't match            error("Incorrect password");            return;        }         currentUser = gar.getAccount(userN);        return;    }    //update to throw error pop-up later    public static void error(String er) { System.out.println(er); }}

Answer 1

您的语法不正确，if 语句的条件不应以分号结束。

 package main;

    import java.util.Scanner;

    public class Main {

        private static Scanner input;

        private static Garage gar;

        private static Attendant currentUser;

        private static boolean isManager;

        public static void main(String[] args) {

            input = new Scanner(System.in);

            gar = new Garage(10, 80, 10);

            currentUser = null;

            while (currentUser == null)

                logIn();

        }

        public static void logIn() {

            System.out.println("Enter username: ");

            String userN = input.nextLine();

            System.out.println("Enter password:");

            String userP = input.nextLine();

            //if no username, go back

            if(gar.getAccount(userN) == null) { 

                error("Incorrect username");

                return;

            } 

            if(gar.getAccount(userN).getPassword().equals(userP) == false) { //if entered password doesn't match

                error("Incorrect password");

                return;

            } 

            currentUser = gar.getAccount(userN);

            return;

        }

        //update to throw error pop-up later

        public static void error(String er) { System.out.println(er); }

    }