如何在 Java 中使用 Scanner 将值存储在自定义对象数组中？

问：

我参加了一次考试，我必须创建一个类，之后，我必须编写两个函数，其中输入参数是一个对象数组，并从用户输入中获取值。下面是我写的代码。但是，我在第 17 行和第 18 行中重复得到了 NullPointerException 和 InputMismatchException。请帮帮我。

import java.util.Scanner;
public class Solution
{
public static void main(String[] args)
{
//code to read values
//code to call required method
//code to display the result

    Scanner sc = new Scanner(System.in);
    int tasks = sc.nextInt();
    
    Bank[] banks = new Bank[tasks];
    
    for(int i = 0; i < tasks; i++){
        int bankId = sc.nextInt();      
        String bankName = sc.next();
        int numberOfCustomers = sc.nextInt();
        // banks[i].setNumberOfCustomers(numberOfCustomers);
        String city = sc.nextLine();
        // banks[i].setCity(city);
        
        banks[i] = new Bank(bankId, bankName, numberOfCustomers, city);
    }
    
    
    String city = sc.next();
    
    if(findAvgNumberOfCustomersByCity(banks, city) != 0){
        System.out.println(findAvgNumberOfCustomersByCity(banks, city));
    }
    else{
        System.out.println("No Bank found with matching criteria.");
    }

    String ans = getBankWithMinimumNoOfCustomers(banks);
    if(ans.equals(null)){
        System.out.println("No Bank found with matching criteria.");
    }
    else{
        for(Bank b : banks){
            if(b.getBankName().equals(ans)){
                System.out.println(b.getBankId());
                System.out.println(b.getBankName());
                System.out.println(b.getNumberOfCustomers());
                System.out.println(b.getCity());
            }
        }
    }
}

//code the first method
public static double findAvgNumberOfCustomersByCity(Bank[] banks, String city){
    
    double ans = 0;
    double total = 0, totalBanks = 0;
    
    for(Bank b : banks){
        if(b.getCity().equals(city)){
            total += b.getNumberOfCustomers();
            totalBanks++;
        }
    }
    
    return (total/totalBanks);
}

//code the second method
public static String getBankWithMinimumNoOfCustomers(Bank[] banks){
    int minNumber = Integer.MAX_VALUE;
    String bankName = "";
    for(Bank b : banks){
        if(b.getNumberOfCustomers() < minNumber){
            minNumber = b.getNumberOfCustomers();
            bankName = b.getBankName();
        }
    }
    
    if(minNumber == Integer.MAX_VALUE){
        return null;
    }
    else{
        return bankName;
    }
}
}

//code the class
class Bank{
    private int bankId;
    private String bankName;
    private int numberOfCustomers;
    private String city;
    
    public Bank(int bankId, String bankName, int numberOfCustomers, String city){
        this.bankId = bankId;
        this.bankName = bankName;
        this.numberOfCustomers = numberOfCustomers;
        this.city = city;
    }
    public int getBankId(){
        return this.bankId;
    }
    public void setBankId(int bankId){
        this.bankId = bankId;
    }
    
    public String getBankName(){
        return this.bankName;
    }
    public void setBankName(String bankName){
        this.bankName = bankName;
    }
    
    public int getNumberOfCustomers(){
        return this.numberOfCustomers;
    }
    public void setNumberOfCustomers(int numberOfCustomers){
        this.numberOfCustomers = numberOfCustomers;
    }
    
    public String getCity(){
        return this.city;
    }
    public void setCity(String city){
        this.city = city;
    }
}

任何人都可以帮助我找到代码中的错误，我很困惑，并尝试了很多方法来获得答案，但无法得到答案。