一道java编程题，有人能帮我看看嘛

Question

在题目给出的代码之后加入我的代码，一直没有结果。（题目说给出的代码可能有错，但是我找不到）

class Bank{
    private Customer[] customers;
    private int numOfCustomers;
    public Bank(){
        customers = new Customer[5];
    }
    public Customer getCustomer(int i) {
        return customers[i];
    }
    public void addCustomer(String f, String l){
        Customer customer = new Customer(f, l);
        customers[numOfCustomers++] = customer;
    }
    public int getNumOfCustomers(){
        return numOfCustomers;
    }
}

class Account{
    protected double balance;
    public Account(double balance) {
        this.balance = balance;
    }
    public double getBalance() {
        return balance;
    }
    public boolean deposit(double amt){
        balance += amt;
        return true;
    }
    public boolean withdraw(double amt){
        if (amt<=balance){
            balance -= amt;
            return true;
        }else{
            return false;
        }
    }
}
class SavingsAccount extends Account{
    public double interestRate;
    public SavingsAccount(double balance, double interestRate) {
        super(balance);
        this.interestRate = interestRate;
    }
}
class CheckingAccount extends Account{
    public double  overdraftProtection;
    public CheckingAccount(double balance) {
        super(balance);
    }
    public CheckingAccount(double balance, double overdraftProtection) {
        super(balance);
        this.overdraftProtection = overdraftProtection;
    }
    public boolean withdraw(double amt){
        if (amt<=balance){
            balance -= amt;
            return true;
        }else if(amt - balance <= overdraftProtection){
            balance = 0;
            overdraftProtection -= amt-balance;
            return true;
        }else{
            return false;
        }
    }
}
class Customer{
    private String firstname;
    private String lastname;
    private Account[] account;
    private int numOfAccounts;
    public Customer(String firstname, String lastname) {
        this.firstname = firstname;
        this.lastname = lastname;
        account = new Account[5];
    }
    public String getFirstName() {
        return firstname;
    }
    public String getLastName() {
        return lastname;
    }

    public void addAccount(Account ac){
        account[numOfAccounts] = ac;
        numOfAccounts++;
    }

    public int getNumOfAccounts(){
        return numOfAccounts;
    }

    public Account getAccount(int index){
        return account[index];
    }
}

结果如下图：

求解决

Answer 1

这是题目给出的代码块，我觉得我的类应该是没问题的，所以我觉得是这下面出了问题，有大牛能帮忙看一下嘛，xx

/*
* This class creates the program to test the banking classes.
* It creates a set of customers, with a few accounts each,
* and generates a report of current account balances.
*/

//import banking.*;
import java.text.NumberFormat;

public class Main{

public static void main(String[] args) {
Bank bank = new Bank();
NumberFormat currency_format = NumberFormat.getCurrencyInstance();

Customer customer;
int curCustomer = 0;
Scanner s = new Scanner(System.in);
int t = s.nextInt();
s.nextLine();
// Create several customers and their accounts according to data
while (t-- > 0) {
String f = s.next();
String l = s.next();
s.nextLine();
bank.addCustomer(f, l);
customer = bank.getCustomer(curCustomer++);
int numAccount = s.nextInt();
s.nextLine();
while (numAccount-- > 0) {
String[] type = s.nextLine().split(" ");
double balance;
double interesOrProtect;
if (type[0] == "C" || type[0] == "c") {
balance = Double.parseDouble(type[1]);
if (type.length == 3) {
interesOrProtect = Double.parseDouble(type[2]);
customer.addAccount(new CheckingAccount(balance,
interesOrProtect));
} else {
customer.addAccount(new CheckingAccount(balance));
interesOrProtect = Double.parseDouble(type[2]);
}
} else if (type[0] == "S" || type[0] == "s") {
balance = Double.parseDouble(type[1]);
interesOrProtect = Double.parseDouble(type[2]);
customer.addAccount(new SavingsAccount(balance,
interesOrProtect));
} else if (type[0] == "A" || type[0] == "a") {
int cIndex = Integer.parseInt(type[1]);
int aIndex = Integer.parseInt(type[1]);
customer.addAccount(bank.getCustomer(cIndex).getAccount(
aIndex));
}
}
}

// Generate a report
System.out.println("CUSTOMERS REPORT");
System.out.println("================");

for ( int cust_idx = 0; cust_idx < bank.getNumOfCustomers(); cust_idx++ ) {
customer = bank.getCustomer(cust_idx);

System.out.println();
System.out.println("Customer: "
+ customer.getLastName() + ", "
+ customer.getFirstName());

for ( int acct_idx = 0; acct_idx < customer.getNumOfAccounts(); acct_idx++ ) {
Account account = customer.getAccount(acct_idx);
String account_type = "";

// Determine the account type
/*** Step 1:
**** Use the instanceof operator to test what type of account
**** we have and set account_type to an appropriate value, such
**** as "Savings Account" or "Checking Account".
***/

// Print the current balance of the account
/*** Step 2:
**** Print out the type of account and the balance.
**** Feel free to use the currency_format formatter
**** to generate a "currency string" for the balance.
***/
}
}
}
}