package com.atuigu.exer4;

import org.omg.CORBA.PUBLIC_MEMBER;

public class Account {

    private double balance;

    public Account(double init_balance) {

        this.balance = init_balance;

    }

    public double getBalance() {

        return balance;

    }

    public void deposit(double amt) {

        if(amt>0) {

            balance +=amt;

            System.out.println("存钱成功");

        }

    }

    public void withdraw(double amt) {

        if(balance>=amt) {

            balance-=amt;

            System.out.println("余额不足");

        }

    }//支

}//主函数结束

package com.atuigu.exer4;

public class Customer {

    private String firstName;

    private String lastName;

    private Account account;

    public Customer(String f, String l) {

        this.firstName = f;

        this.lastName = l;

    }

    public String getFirstName() {

        return firstName;

    }

    public void setFirstName(String firstName) {

        this.firstName = firstName;

    }

    public String getLastName() {

        return lastName;

    }

    public void setLastName(String lastName) {

        this.lastName = lastName;

    }

    public Account getAccount() {

        return account;

    }

    public void setAccount(Account account) {

        this.account = account;

    }

}

package com.atuigu.exer4;

public class Bank {

    private Customer[] customers;

    //定义一个可以装很多用户的数组类;

    private int  numberofCustomer;

    public Bank() {

        customers = new Customer[10];

    }

    public void addCustomer(String f,String l) {

        Customer cust = new Customer(f,l);

        customers[numberofCustomer] = cust;

        numberofCustomer++;

    }

    public int getNumofCustomers(){

        return numberofCustomer;

    }

    public Customer getCustomer(int index) {

        if(index>=0 && index < numberofCustomer){

        return customers[index];

        }

        return null;

    }

    }

package com.atuigu.exer4;

public class BankTest {

    public static void main(String[] args) {

        Bank bank = new Bank();

        bank.addCustomer("jane","Smith");

        bank.addCustomer("ok", "err");

        Account a = new Account(2000);

        bank.getCustomer(0).setAccount(a);

        bank.getCustomer(0).getAccount().withdraw(500);

        double balance = bank.getCustomer(0).getAccount().getBalance();

        System.out.print(""+bank.getCustomer(0).getFirstName());

        System.out.println("奶奶的银业有我少个"+ bank.getNumofCustomers());

    }

}