package com.buaa.account;
publicabstractclass Account {
privateint id;
private String userName;
privatedouble balance;
publicstaticintCurrentID = 100;
//开户时调用的构造方法
public Account(String userName, double balance) {
this.userName = userName;
this.balance = balance;
id = CurrentID++;
}
//读取文件加载数据时用的构造方法
public Account(int id, String userName, double balance) {
this.id = id;
this.userName = userName;
this.balance = balance;
}
publicstaticint getCurrentID() {
returnCurrentID;
}
publicstaticvoid setCurrentID(int currentID) {
CurrentID += currentID;
}
publicint getId() {
return id;
}
publicvoid setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
publicvoid setUserName(String userName) {
this.userName = userName;
}
publicdouble getBalance() {
return balance;
}
publicvoid setBalance(double balance) {
this.balance = balance;
}
// 存款
publicvoid deposit(double money) {
balance += money;
}
// 取款
publicvoid withdraw(double money) throws BalanceNotEnoughException {
if (balance < money) {
thrownew BalanceNotEnoughException("余额不足！");
} else {
balance -= money;
}
}
@Override
public String toString() {
// TODO Auto-generated method stub
return id + "\t" + userName + "\t" + balance;
}
publicabstractdouble interest();
}
package com.buaa.account;
publicclassBalanceNotEnoughExceptionextends Exception {
public BalanceNotEnoughException(String message) {
super(message);
}
}
package com.buaa.account;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
public class Bank {
//所有的用户信息都存放在此map中
private Map<Integer, Account> map = new LinkedHashMap<Integer, Account>();
//开户，向map中加入一个Account对象
public void insertAccount(Account account) {
map.put(account.getId(), account);
}
//以数组的形式返回map中的所有数据
public Account[] getAllAccount() {
Collection<Account> c = map.values();
Account[] a = c.toArray(new Account[0]);
return a;
}
public Account getAccount(int id) {
return map.get(id);
}
}
package com.buaa.account;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int select = 0 ;
String fileName = "Account.dat";
Bank bank = new Bank();
DataAccount.dataLoad(fileName, bank);
Account acc = null;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
do {
try {
System.out.println("请选择： 1-管理员 2-用户 0-退出");
select = Integer.parseInt(br.readLine());
if(select==1) {
System.out.println("管理员模块菜单");
System.out.println("1. 开户");
System.out.println("2. 查询所有账户");
System.out.println("0. 退出");
System.out.print("请输入菜单号：");
select = Integer.parseInt(br.readLine());
switch(select) {
case 1:
System.out.print("请输入开户户名：");
String userName = br.readLine();
System.out.print("请输入开启金额:");
double balance = Double.parseDouble(br.readLine());
System.out.print("请选择利息类型（1.固定利率 2.浮动利率）");
int type = Integer.parseInt(br.readLine());
if(type==1) {
acc = new FixedAccount(userName, balance);
}else if(type==2) {
acc = new FloatAccount(userName, balance);
}
bank.insertAccount(acc);
DataAccount.savedData(fileName, bank);
System.out.println("开户成功！！！！！");
break;
case 2:
System.out.println("账户id\t账户名\t账户余额");
Account[] array = bank.getAllAccount();
for(Account a : array) {
System.out.println(a.getId() + "\t" + a.getUserName() + "\t" + a.getBalance());
}
break;
case 0:
default:
break;
}
}else if(select==2) {
System.out.println("用户模块菜单");
System.out.println("1. 存款");
System.out.println("2. 取款");
System.out.println("3. 查看本账户利息");
System.out.println("0. 退出");
System.out.print("请先输入一个账户ID：");
int id = Integer.parseInt(br.readLine());
acc = bank.getAccount(id);
if(acc==null) {
System.out.println("该账户不存在！！！");
}else {
System.out.println(acc);
System.out.print("请输入菜单号：");
select = Integer.parseInt(br.readLine());
double money = 0;
switch(select) {
case 1:
System.out.print("请输入存钱的数目：");
money = Double.parseDouble(br.readLine());
acc.deposit(money);
DataAccount.savedData(fileName, bank);
System.out.println(acc.getUserName() + "成功地存入$" + money);
System.out.println(acc);
break;
case 2:
System.out.print("请输入取钱的数目：");
money = Double.parseDouble(br.readLine());
acc.withdraw(money);
DataAccount.savedData(fileName, bank);
System.out.println(acc.getUserName() + "成功地取出$" + money);
System.out.println(acc);
break;
case 3:
System.out.println(acc.getUserName() + "的利息是" + acc.interest());
break;
case 0:
default:
break;
}
}
}
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (BalanceNotEnoughException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("----------------------------------");
}while(select!=0);
try {
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.buaa.account;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class DataAccount {
public static void dataLoad(String fileName, Bank bank) {
try {
BufferedReader br = new BufferedReader(new FileReader(fileName));
String s;
int count = 0;
while ((s = br.readLine()) != null) {
String[] str = s.split(",");
Account acc = null;
if (str[3].equals("1")) {
acc = new FixedAccount(Integer.parseInt(str[0]), str[1],
Double.parseDouble(str[2]));
} else if (str[3].equals("2")) {
acc = new FloatAccount(Integer.parseInt(str[0]), str[1],
Double.parseDouble(str[2]));
}
bank.insertAccount(acc);
count++;
}
br.close();
Account.setCurrentID(count);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void savedData(String fileName, Bank bank) {
try {
Account[] acc = bank.getAllAccount();
BufferedWriter bw = new BufferedWriter(new FileWriter(fileName));
String s;
for (int i = 0; i < acc.length; i++) {
s = acc[i].getId() + "," + acc[i].getUserName() + ","
+ acc[i].getBalance();
if (acc[i] instanceof FixedAccount) {
s += "," + 1;
} else if (acc[i] instanceof FloatAccount) {
s += "," + 2;
}
bw.write(s);
bw.newLine();
}
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.buaa.account;
publicclass FixedAccount extends Account {
public FixedAccount(String userName, double balance) {
super(userName, balance);
}
public FixedAccount(int id, String userName, double balance) {
super(id, userName, balance);
}
@Override
publicdouble interest() {
// TODO Auto-generated method stub
returnthis.getBalance() * 0.03;
}
}
package com.buaa.account;
publicclass FloatAccount extends Account {
public FloatAccount(String userName, double balance) {
super(userName, balance);
}
public FloatAccount(int id, String userName, double balance) {
super(id, userName, balance);
}
@Override
publicdouble interest() {
// TODO Auto-generated method stub
double balance = this.getBalance();
if(balance<=5000) {
return balance * 0.01;
}elseif(balance <=100000) {
return balance * 0.02;
}else {
return balance * 0.05;
}
}
}
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