0925-----homework

/**
  *
  */
package com.kai.li.bank;
import java.util.List;
import java.util.ArrayList;
/**
  *
  */
public class BankText{
    /**
       *
       */
    public static void main(String[] args){
        Account a1=new Account(500.00);        //
        try{
            a1.withdraw(650.00);        //
        }catch(OverdraftException o){
        }
        a1.deposit(22.50);            //
        try{
            a1.withdraw(47.62);        //
        }catch(OverdraftException o){
            o.printStackTrace();        //
        }
        System.out.println("The account has a balance of "+a1.getBalance());
    }
}
/**
  *
  */
class Account{
    /**
       *
       */
    protected double balance;
    /**
       *
       */
    Account(double balance){
        this.balance=balance;
    }
    /**
       *
       */
    public double getBalance(){
        return this.balance;
    }
    /**
       *
       */
    public boolean deposit(double amt){
        if(amt<0)
            return false;
        this.balance+=amt;
        return true;
    }
    /**
       *
       */
    public void withdraw(double amt)throws OverdraftException{
        if(amt>balance)
            throw new OverdraftException("Balance is not enough! ---",amt-balance );
        this.balance-=amt;
    }
}
/**
  *
  */
class Customer{
    /**
       *
       */
    private String firstName;
    private String lastName;
    private Account account;
    /**
       *
       */
    Customer(String firstName,String lastName){
        this.firstName=firstName;
        this.lastName=lastName;
    }
    public String getFirstName(){
        return this.firstName;
    }
    public String getLastName(){
        return this.lastName;
    }
    public void setAccount(Account account){
        this.account=account;
    }
    public Account getAccount(){
        return this.account;
    }
    @Override
    public String toString(){
        return this.getLastName()+" "+this.getFirstName();
    }
}
/**
  *
  */
class Bank{
    /**
       *
       */
    private final static Bank bank=new Bank();
    private Customer[] customers;
    private int numberOfCustomers;
    /**
       *
       */
    private Bank(){
        customers=new Customer[6];
    }
    /**
       *
       */
    public static Bank getBank(){
        return bank;
    }
    public int getNumberOfCustomers(){
        return this.numberOfCustomers;
    }
    public Customer getCustomer(int i){
        if(i>=numberOfCustomers){
            System.out.println("Number is wrong!");
            return null;
        }
        return this.customers[i];
    }
    public void addCustomer(String firstName,String lastName){
        this.customers[numberOfCustomers]=new Customer(firstName,lastName);
        numberOfCustomers+=1;
    }
}
/**
  *
  */
class ListBank{
    /**
       *
       */
    private List<Customer> customers;
    private int numberOfCustomers;
    /**
       *
       */
    public ListBank(){
        customers=new ArrayList<>();
    }
    public int getNumberOfCustomers(){
        return this.numberOfCustomers;
    }
    public Customer getCustomer(int i){
        if(i>=numberOfCustomers){
            System.out.println("Number is wrong!");
            return null;
        }
        return this.customers.get(i);
    }
    public void addCustomer(String firstName,String lastName){
        customers.add(new Customer(firstName,lastName));
        numberOfCustomers=customers.size();
    }
}
/**
  *
  */
class SavingsAccount extends Account{
    /**
       *
       */
    private double interestRate;
    /**
       *
       */
    SavingsAccount(double balance,double interestRate){
        super(balance);
        this.interestRate=interestRate;
    }
    /**
       *
       */
    public double getInterestRate(){
        return this.interestRate;
    }
}
/**
  *
  */
class CheckingAccount extends Account{
    /**
       *
       */
    private double overdraftProtection;
    /**
       *
       */
    CheckingAccount(double balance){
        super(balance);
    }
    /**
       *
       */
    CheckingAccount(double balance,double overdraftProtection){
        this(balance);
        this.overdraftProtection=overdraftProtection;
    }
    /**
       *
       */
    public double getOverdraftProtection(){
        return this.overdraftProtection;
    }
    /**
       *
       */
    @Override
    public void withdraw(double amount)throws OverdraftException{
        if(balance >=amount&&amount>0){
            balance-=amount;
            return;
        }
        if((balance+overdraftProtection)>=amount&&amount>0){
            balance=0;
            overdraftProtection-=amount-balance;
            throw new OverdraftException("overdract protection: ",overdraftProtection-amount+balance);
        }
        throw new OverdraftException("no overdraft protection--- ",amount-balance-overdraftProtection);
    }        
}
/**
  *
  */
class CustomerReport{
    Bank bank=Bank.getBank();
}
/**
  *
  */
class OverdraftException extends Exception{
    /**
       *
       */
    private double deficit;
    /**
       *
       */
    OverdraftException(String message,double deficit){
        this.deficit=deficit;
        System.out.println(message+this.deficit);
    }
    /**
       *
       */
    public double getDeficit(){
        return this.deficit;
    }
}