Java 数组对象 小测试

package com.bytezero.bank;
/**
 * 
 * @Description 
 * @author  Bytezero·zhenglei!      Email:420498246@qq.com
 * @version
 * @date 2021年9月15日下午11:53:31
 * @
 *
 */
public class BankTest
{
    public static void main(String[] args) 
    {
        Bank bank = new Bank();
        
        
        bank.addCustomer("Byte", "zero");
        
        
        //连续操作
        bank.getCunstomer(0).setAccount(new Account(2000));
        
        bank.getCunstomer(0).getAccount().withdraw(500);
        
        double balance    = bank.getCunstomer(0).getAccount().getBalance();
        
        System.out.println("客户"+bank.getCunstomer(0).getFirstName()+"的账户余额为："+balance);
        
        System.out.println("*******************************");
        
        bank.addCustomer("Byte2", "zero2");
        
        bank.getCunstomer(1).setAccount(new Account(2000));
        
        bank.getCunstomer(1).getAccount().withdraw(500);
        
        double balance1    = bank.getCunstomer(1).getAccount().getBalance();
        
        System.out.println("客户"+bank.getCunstomer(1).getFirstName()+"的账户余额为："+balance);
    
    
        System.out.println("银行客户的个数为："+bank.getNumberOfCustomers());
    
    }
}

package com.bytezero.bank;

public class Bank {

    private Customer[] customers; //存放多个客户的数组
    
    //private Customer[] customers=10; //1:
    private int numberOfCustomers; //记录客户的个数
    
    public Bank()
    {
        customers = new Customer[10];  //1:
    }
    
    //添加客户
    public void addCustomer(String f,String l)
    {
        Customer cust = new Customer(f,l);
//        customers[numberOfCustomers] = cust;
//        numberOfCustomers++;
        customers[numberOfCustomers++] = cust;
        
        
    }
    
    
    //获取客户的个数
    public int getNumberOfCustomers()
    {
        return numberOfCustomers;
    }
    
    //取指定位置的客户
    public Customer getCunstomer(int index)
    {
//        return customers[index];   //可能报异常
        if(index >= 0 && index < numberOfCustomers)
        {
            return customers[index];
        }
        
        return null;
    }
    
}

package com.bytezero.bank;

public class Account
{
    private double balance;
    
    
    public Account(double init_balance)
    {
        this.balance = init_balance;
    }
    
    public double getBalance()
    {
        return balance;
    }
    
    //存钱操作
    public void deposit(double amt)
    {
        if(amt > 0)
        {
            balance += amt;
            System.out.println("存钱成功！");
        }
    }
    
    //取钱操作
    public void withdraw(double amt)
    {
        if(balance >= amt)
        {
            balance -= amt;
            System.out.println("取钱成功");
            
            
        }
        else
        {
            System.out.println("余额不足");
        }
    }
    
}

package com.bytezero.bank;

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 Account getAccount() {
        return account;
    }


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


    public String getFirstName() {
        return firstName;
    }


    public String getLastName() {
        return lastName;
    }
    
    
    
    
}