Java 封装+构造器+this 小测试

package com.bytezero.account;


public class Account 
{
    private int id;     //账号
    private double balance;  //余额
    private double annualInterestRate; //年利率
    
    
    //构造器
    public Account(int id, double balance, double annualInterestRate) 
    {
        
        this.id = id;
        this.balance = balance;
        this.annualInterestRate = annualInterestRate;
    }


    // set  get
    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;
    }
    
    //方法
    public void withdraw(double amount)   //取钱
    {
        if(balance < amount)
        {
            System.out.println("取款失败！！！！");
            return;
        }
        balance -= amount;
        System.out.println("成功取出:"+ amount);
    }
    public void dsposit(double amount)  //存钱
    {
        if(amount > 0)
        {
            balance += amount;
            System.out.println("成功存入"+amount);
        }
    }
    
    
    
    
    
    
}

package com.bytezero.account;

public class Customer 
{
    private String firstName;
    private String laseName;
    private Account account;
    
    
    
    public Customer(String f,String l)
    {
        this.firstName = f;
        this.laseName = l;
    }



    public Account getAccount() {
        return account;
    }



    public void setAccount(Account account) {
        this.account = account;
    }



    public String getFirstName() {
        return firstName;
    }



    public String getLaseName() {
        return laseName;
    }
    
    
    
    
    
    
    
    
}

package com.bytezero.account;

/**
 * 
 * @Description 
 * @author  Bytezero·zhenglei!      Email:420498246@qq.com
 * @version
 * @date 2021年9月15日下午9:55:22
 * @  小测试
 *
 */
public class CustomerTest
{
    public static void main(String[] args) 
    {
        Customer cust = new Customer("Jane","Smith");
        
        Account acct = new Account(1000, 2000, 0.0123);
        
        cust.setAccount(acct);
        
        cust.getAccount().dsposit(100);
        cust.getAccount().withdraw(960);
        cust.getAccount().withdraw(2000);
        
        System.out.println("客户叫："+cust.getFirstName()+cust.getLaseName());
        System.out.println("客户的id："+cust.getAccount().getId());
        
    }
}