This关键字练习

Account：

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);
    }

}

Customer：

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;
    }

}

TestCustomer：

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