面向对象 综合练习

236. 面向对象 总和练习

练习1

创建一个账户类Account

属性: id ,balance 余额, rate 利率

方法: get,set方法, 取款方法withdraw(), 存款方法deposit().

创建一个客户类Customer

属性: name, Account 账户

方法: name的get,set 方法. Account的get方法----用这个方法来调用Account类的方法.

创建一个客户测试类CustomerTest

创建Customer对象来进行操作

public class Account {
        //属性
        private int id;  //账号
        private double balance;//余额
        private double rate;//利率
        //构造器 给属性赋值
        public Account(int id ,double balance , double rate){
            this.id = id ;
            this.balance = balance ;
            this.rate = rate ;
        }
        //get ,set 方法
        public void setId(int id) {
            this.id = id ;
        }
        public int getId() {
            return id ;
        }
        public void setBalance(double balance) {
            this.balance = balance ; 
        }
        public double getBalance() {
            return balance ;
        }
        public double getRate() {
            return rate;
        }
        public void setRate(double rate) {
            this.rate = rate;
        }
        //取款方法
        public void withdraw(double amount){
            if (amount>balance) {
                System.out.println("余额不足,取款失败.");
                return;
            }
            balance = balance - amount ;
            System.out.println("成功取出:"+amount+",余额是:"+ balance);
        }
        //存款方法
        public void deposit(double amount){
            if(amount>0) {
                balance += amount ;
                System.out.println("成功存入:"+amount+",余额是:"+ balance);
            }
        }
}
------------------------------------------
    
    public class Customer {
    //属性
    private String name; //名字
    private Account account ; //账户
    //构造器
    public Customer(String name){
        this.name = name;
    }
    //name的get方法
    public String getName() {
        return name;
    }
    //Account的 get,set方法
    public Account getAccount() {
        return account;      //get到账户和Account类联系
    }
    public void setAccount(Account account) {
        this.account = account;
    }
}
​
-------------------------------------------
   public class CustomerTest {
    public static void main(String[] args) {
    //创建客户对象cust    
    Customer cust = new Customer("佩奇") ; 
    //创建账户对象acco
    Account acco = new Account(1234,2000.0,0.0123);
    //把账户对象(acco)赋值给客户对象(cust)
    cust.setAccount(acco);//把Account类的对象赋值给Customer类的对象
    //对客户"佩奇"进行操作
    //存入100元
    cust.getAccount().deposit(100);
    //取出960元
    cust.getAccount().withdraw(960);
    //再取出2000元
    cust.getAccount().withdraw(2000);
    //先get获取的这个账户类,就可以调用账户类里的方法了.
    //打印客户信息
    System.out.println("客户:"+cust.getName()+",账号:"
    +cust.getAccount().getId()+",利率:"+cust.getAccount().getRate()
    *100+"%,账户余额:"+cust.getAccount().getBalance());
    }
}
--------------------------------------------
成功存入:100.0,余额是:2100.0
成功取出:960.0,余额是:1140.0
余额不足,取款失败.
客户:佩奇,账号:1234,利率:1.23%,账户余额:1140.0
​