无法使用扫描仪方法从键盘读取字符

Question

我是Java的初学者，并试图创建一个非常基本的汽车租赁计划。我遇到的问题是，当我第一次运行我的代码时，它按预期工作。每当我在完成汽车预订后提供用户输入为Y时，为了继续下一个客户，代码将停止，并且＃34;输入您的姓名＆＃34;，扫描仪无法从键盘读取字符。请提供最佳解决方案来解决此问题。

import java.util.Scanner;

public class Application {
    static Scanner input = new Scanner(System.in);
    static CustomerActivities customer = new CustomerActivities();
    static CarInventory carInventory = new CarInventory();
    public static void main(String[] args) {
        userName();
        customer.displayWelcomeMessage();
        carInventory.carList();
        carInventory.displayCars();
        carOptions();
        carInventory.searchCarAvailability();
        carConfirmation();
        carInventory.rentCar();
        carInventory.getInventory();
        anotherCustomer();
        input.close();
    }

    public static void userName(){
        System.out.println("Enter your name");
        System.out.println("boom");
        String userName = input.nextLine();
        System.out.println("bane");
        customer.setUserName(userName);
    }

    public static void carOptions(){
        System.out.println("Enter the car you would like to Rent");
        int userCarOption = input.nextInt();
        carInventory.setUserCarOption(userCarOption);
    }

    public static void carConfirmation(){
        char userConfirmation = input.next().charAt(0);
        carInventory.setUserConfirmation(userConfirmation);
    }

    public static void anotherCustomer(){
        System.out.println("Do you have any other customer");
        char customerContinue = input.next().charAt(0);
        if(customerContinue =='Y'){
            System.out.println("You can start entering the next customer details");
            userName();
        }
    }
}