package com.aff.ex;

public class Account {

    private int id;// 账号

    private double balance;// 余额

    private double annualInterestRate;// 年利率

    public Account(int id, double balance, double annualInterestRate) {

        this.id = id;

        this.balance = balance;

        this.annualInterestRate = annualInterestRate;

    }

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public double getBalance() {

        return balance;

    }

    public void setBalance(double balance) {

        this.balance = balance;

    }

    public double getAnnualInterestRate() {

        return annualInterestRate;

    }

    public void setAnnualInterestRate(double annualInterestRate) {

        this.annualInterestRate = annualInterestRate;

    }

    // 取钱

    public void withdraw(double amount) {

        if (balance >= amount) {

            balance -= amount;

            System.out.println("成功取出" + amount);

        } else {

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

        }

    }

    // 存钱

    public void deposit(double amount) {

        balance += amount;

        System.out.println("成功存入" + amount);

    }

}

package com.aff.ex;

public class Customer {

    private String fristName;

    private String lastName;

    private Account account;

    public Customer(String f, String l) {

        this.fristName = f;

        this.lastName = l;

    }

    public Account getAccount() {

        return account;

    }

    public void setAccount(Account account) {

        this.account = account;

    }

    public String getFristName() {

        return fristName;

    }

    public String getLastName() {

        return lastName;

    }

}

package com.aff.ex;

//创建一个Customer，起名叫Jane Smith，

//他账号为1000 ，余额2000，年利率1.23%

//操作：  存入100，再取出950，再取出2000，打印Jane Smith的基本信息

public class TestCustomer {

    public static void main(String[] args) {

        Customer cus = new Customer("Jane", "Smith");

        cus.setAccount(new Account(1000, 2000, 0.0123));// 使用匿名的方式创建

        Account acc = cus.getAccount();

        acc.deposit(100);

        acc.withdraw(960);

        acc.withdraw(2000);

        System.out.println("Customer[" + cus.getLastName() + "," + cus.getFristName() 
+ "] has a account: id is"

+ acc.getId() + "annualInterestRate" + acc.getAnnualInterestRate() * 100 + "%"

+ "balance is"

+ acc.getBalance());

    }

}

输出结果：

成功存入100.0
成功取出960.0
余额不足
Customer[Smith,Jane] has a account: id is1000annualInterestRate1.23%balance is1140.0