［代码展示］登录

还请各位帮忙看看，修改一下

注：这不能生成一个登录界面，而是一个思路

import java.util.*;

public class NjavaT01 {
    public static void greeting(String name) {
        System.out.println("Hello, "+name+" ! Welcome to CoLand.");
    }
    static Map<String,String> userStorage = new HashMap<>();
    public static void main(String []args) {
        MAINLOOP:while(true){
            Scanner sc = new Scanner(System.in);
            System.out.println("Please enter your order(number): ");
            System.out.println("1. login.");
            System.out.println("2. register.");
            int order = sc.nextInt();
            if(order == 1) {
                System.out.println("Please enter your nameL: ");
                String usernameL = sc.next();
                if(userStorage.containsKey(usernameL)) {
                    for(int i = 3;i >= 0;i--) {
                        System.out.println("Please enter you passwordL: ");
                        String passwordL = sc.next();
                        if(passwordL.equals(userStorage.get(usernameL))) {
                            greeting(usernameL);
                            break MAINLOOP;
                        } else {
                            System.out.println("Your password is wrong.");
                            System.out.println("Please try again !");
                        }
                    }
                } else {
                    System.out.println("Your name is not exist.");
                    System.out.println("Please try again or to regist");
                }
            } else if(order == 2) {
                System.out.println("Please enter your nameR: ");
                String usernameR = sc.next();
                System.out.println("Please enter your passwordL:");
                String passwordR = sc.next();
                LOOP:for(int i = 3;i >= 0;i--) {
                    System.out.println("Please enter your password again:");
                    String passwordRR = sc.next();
                    if(passwordR.equals(passwordRR)) {
                        userStorage.put(usernameR,passwordR);
                        System.out.println("You have successfully regist");
                        break LOOP;
                    }else {
                        System.out.println("Your passwords can not match.");
                    }
                }
            } else {
                System.out.println("Your order is wrong !");
            }
        }
    }
}