银行账户管理.docx

Account.javapackage com.buaa.account;public abstract class Account private int id;private String userName;private double balance;public static int CurrentID = 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;public static int getCurrentID() return CurrentID;public static void setCurrentID(int currentID) CurrentID += currentID;public int getId() return id;public void setId(int id) this.id = id;public String getUserName() return userName;public void setUserName(String userName) this.userName = userName;public double getBalance() return balance;public void setBalance(double balance) this.balance = balance;/ 存款public void deposit(double money) balance += money;/ 取款public void withdraw(double money) throws BalanceNotEnoughException if (balance money) throw new BalanceNotEnoughException(余额不足！); else balance -= money;Overridepublic String toString() / TODO Auto-generated method stubreturn id + t + userName + t + balance;public abstract double interest();BalanceNotEnoughException.javapackage com.buaa.account;public class BalanceNotEnoughException extends Exception public BalanceNotEnoughException(String message) super(message);Bank.javapackage 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 map = new LinkedHashMap();/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 c = map.values();Account a = c.toArray(new Account0);return a;public Account getAccount(int id) return map.get(id);Client.javapackage 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 stubint 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idt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 + erest();break;case 0:default:break; catch (NumberFormatException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (BalanceNotEnoughException e) / TODO Auto-generated catch blocke.printStackTrace();System.out.println(-);while(select!=0);try br.close(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();DataAccount.javapackage 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 (str3.equals(1) acc = new FixedAccount(Integer.parseInt(str0), str1,Double.parseDouble(str2); else if (str3.equals(2) acc = new FloatAccount(Integer.parseInt(str0), str1,Double.parseDouble(str2);bank.insertAccount(acc);count+;br.close();Account.setCurrentID(count); catch (FileNotFoundException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.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 = acci.getId() + , + acci.getUserName() + ,+ acci.getBalance();if (acci instanceof FixedAccount) s += , + 1; else if (acci instanceof FloatAccount) s += , + 2;bw.write(s);bw.newLine();bw.close(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();FixedAccount.javapackage com.buaa.account;public class FixedAccount extends Account public FixedAccount(String userName, double balance) super(userN